Mitosis Lab AnswersMitosis questions (practice). If the diploid number of chromosomes in a cell is 16 and the cell divides by using mitosis, how many chromosomes will be present in each of the new daughter cell s?. CELL CYCLE IDENTIFICATION LAB: Names: Directions: Use the link below to access the slides for today’s lab. Upon compleion of this exercise, students should be able to Deine and use the terms in bold from this laboratory exercise Describe the stages of interphase Describe the stages of mitosis (prophase, metaphase, anaphase, telophase) Describe the process of cytokinesis. Mitosis are divided into four phases: prophase, metaphase, anaphase,& telophase Centrioles Chromatin Nucleolus Nuclear envelope 5Chromosome 6Sister chromatids 7 Spindle fiber 8CentrosomeInterphase is divided into three phases: G1,S, & G2Interphase is the in between stages of cell division. Investigation: Mitosis and Cancer Cells. Place your chromosomes in this and walk through each stage of Meiosis. Cell Cycle Mitosis Interactive Note Taking Sheet and …. Part 3: Microscopic Mitosis. Table 1: Mitosis Predictions. In the context of the cell cycle, mitosis is the part of the. Students can work in pairs or small groups for Parts 1 and 4. Cancer is a disease related to uncontrolled cell division. Cell Division iPad Lab ANSWERS Please record the lab name AND iPad unit number in your notebook. Onion root tip mitosis refers to a type of cell division where the parent cell produces two identical daughter cells resulting in two diploid daughter Mitosis has 4 major stages --- Prophase, Metaphase, Anaphase, and Telophase. Cell Division iPad Lab ANSWERS. 3: Modeling Mitosis and Meiosis (Activity). Learning Objectives Having completed the lab on mitosis, you should be able to: define the following terms: chromosome, spindle, centromere, centrosome, gametes, somatic, cytokinesis, cleavage furrow, homologues (homologous chromosomes), list the stages of the cell cycle in order. In this part of the lab, you will examine 2 different slides: A cross section of an onion root tip, where cell growth (and consequently mitosis) happens at a rapid rate. This is a process in which the cell increases its size, copies its DNA, prepares to divide, and then divides. (Mitosis) Introduction: In this lab, you will examine the dividing root-tip cells of an onion. Cell cycle in onion roots lab key. These phases occur in strict sequential order, and cytokinesis - the process of dividing the cell contents to make two new cells - starts. ##### BIO 101 Lab 09 : Mitosis and Meiosis Worksheet. ##### BIO 101 Lab 09 : Mitosis and Meiosis Worksheet. This process is necessary for the normal growth and development of a multicellular eukaryotic organism from a zygote (fertilized egg), as well as growth and. One of the basic tenets of biology is that all new cells come from living cells. Mitosis – Pipe Cleaner Activity. Common mistakes and misconceptions Interphase is not part of mitosis. 52010 Cell Division (Mitosis) Lab 12-2 Exercise #1 — Video of the Cell Cycle In this video, you will see the cell cycle including cell division (cytokinesis) as an entire process with one stage blending into the next, rather than a series of distinct steps. Can mitosis ever be used for human reproduction? Answer🠀 Mitosis is a form of cellular reproduction and because it is considered asexual reproduction, it does not require sex. The Cell Cycle & Mitosis">The Cell Cycle & Mitosis. These regions of growth are good for studying the cell cycle because at any given time, you can find cells that are undergoing mitosis. 52010 Cell Division (Mitosis) Lab 12-2 Exercise #1 — Video of the Cell Cycle In this video, you will see the cell cycle including cell division (cytokinesis) as an entire process with one stage blending into the next, rather than a series of distinct steps. In a physics lab, you measure the vibrationalrotational spectrum of \mathrm {HCl} HCl. In order to examine cells in the tip of an onion. Twist each pair together by one turn at the midpoint. In eukaryotic cells, the cell cycle is divided into two major phases: interphase and mitosis (or the mitotic (M) phase). The region of a chromosome where the two sister chromatids attach. What is mitosis? Mitosis is a type of cell division in which one cell (the mother) divides to produce two new cells (the daughters) that are genetically identical to itself. Due to their rigid cell wall, plant cells don't form cleavage. Mitosis is part of a. The shortest stage and the easiest to recognize on the slide. Mitotic cell divisions are used by organisms to repair tissue, growth, and. MICROSCOPY OF CELLS: MITOSIS LAB ANSWER SHEET REVIEW QUESTIONS Answer in complete sentences. Cell Division (Principles): Mitosis and Meiosis Virtual Lab Join a cell biology research group to find out how a poisonous compound from a yew tree can be used in cancer therapy. Mitosis and the Cell Cycle. Nuclear envelope stored in rough ER regenerates. This makes a root tip an excellent tissue to study the stages of cell division. What is mitosis? Mitosis is a type of cell division in which one cell (the mother) divides to produce two new cells (the daughters) that are genetically identical to itself. Students who can answer open-ended questions about the lab truly understand the concepts that are being taught. interphase prophase metaphase anaphase telophase. 3: Modeling Mitosis and Meiosis (Activity) is shared under a CC BY-NC-SA 4. Mitosis (lab) 17 terms. Objective: To explore the stages or phases of mitosis (cell division). Chromosomes become visible during prophase. Microscope Lab: Interphase, Mitosis, & Cytokinesis Directions: Look under the microscope slides and draw what you see. Onion root lab Flashcards. MOVEMENT THROUGH MITOSIS Cell Cycle Division: Mitosis Beads Diagram. Cell Division (Principles): Mitosis and Meiosis Virtual Lab. Common mistakes and misconceptions Interphase is not part of mitosis. The Modeling and Microscopic Observation of Mitosis ">Lab 8. Mitosis Whitefish Blastula Flashcards. Write the equation for the dissolution of each of the following in water, and then indicate the total number of moles of solute ions formed. It occurs in the following 4 separate phases: prophase, metaphase, anaphase, and telophase. Part 2: Mitosis Bead Simulations In this exercise you will make models of chromosomes to study the meiosis chromosome replication and Comparing mitosis and process of mitosis. More than 50% of human cancers have loss of p53 function; this protein blocks mitosis if there is DNA damage. Onion Root Cell Cycle Lab Answers Introduction. M6 Mitosis Timeline Virtual Lab. M phase, which consists of mitosis and cytokinesis, is the portion of the cell cycle where the cell divides, reproducing itself. Lab 8. From the patient information form: Name Josephine Smith Sex F Birth Date 05 / 04 / 1983 Address 9 Brook Rd. Although we often talk about interphase and mitosis together, interphase is technically not part of mitosis. Upon completion of this exercise, students should be able to. Draw a large circle on the paper to represent the cell and the nucleus with a pencil. ) divide by mitosis. It can be predicted that all somatic cells will. In the context of the cell cycle, mitosis is the part of the division process in which the DNA of the cell's nucleus is split into two equal sets of chromosomes. Identify the following cells with their phase of mitosis. Provide the correct order for the stages of mitosis. Mitosis are divided into four phases: prophase, metaphase, anaphase,& telophase Centrioles Chromatin Nucleolus Nuclear envelope 5Chromosome 6Sister chromatids 7 Spindle fiber 8CentrosomeInterphase is divided into three phases: G1,S, & G2Interphase is the in between stages of cell division. The chromosomes line up across the center of the cell. Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase. Compare and contrast mitosis and meiosis. Ask them to consider what would happen if cells with mutated DNA replicated. In addition, time is needed for students to discuss their results from Parts 2 and 5. P53 acts at the G 1 -S checkpoint and initiates DNA repair or apoptosis. How many divisions does mitosis have? 1 How many divisions do meiosis have? 2 Mitosis produces how many cells? 2 genetically identical daughter cells Meiosis produces how many cells? 4 genetically different daughter cells. Mitosis is a complex and highly regulated process. Mitosis Virtual Lab Page 1. The Modeling and Microscopic Observation of Mitosis and Meiosis in Plant and Animal Cells Prelab Assignment Before coming to lab, read carefully the introduction and the procedures for each part of the experiment, and then answer the prelab questions at the end of this lab handout. Lab Background: Mitosis is the mechanism by which the chromosomes of eukaryotes are segregated so that the two daughter cells formed by cell division receive the same number of chromosomes that the parent cell contained. How many divisions does mitosis have? 1 How many divisions do meiosis have? 2 Mitosis produces how many cells? 2 genetically identical daughter cells Meiosis produces how. Predictions My prediction is that interphase will take the longest time of the cell cyclefor approximately 20 hours, and mitotic phase will take 4 hours. The Modeling and Microscopic Observation of Mitosis and Meiosis in Plant and Animal Cells Prelab Assignment Before coming to lab, read carefully the introduction and the procedures for each part of the experiment, and then answer the prelab questions at the. It will default to the first Onion Root Slide. Mitosis is the division of the nucleus to form two Hypothesis. specimen to identify the various phases of the cell cycle, to see which. : Group 2 pipe cleaners of the same color next to each other. Identical copies of a chromosome; full sets of these are created during the S phase of Interphase. Cell division > The cell cycle and mitosis Mitosis questions This cell is in which stage of mitosis? Choose 1 answer: Early prophase A Early prophase Late prophase (prometaphase) B Late prophase (prometaphase) Metaphase C Metaphase Anaphase D Anaphase Telophase E Telophase Stuck? Review related articles/videos or use a hint. Steps of Mitosis. What are the centrosomes (centrioles) doing during prophase? To serve as anchors for the microtubules 6. Telophase begins as soon as chromosomal movement stops. You will be immersed in an animation of a human cell and use light and fluorescence microscopy to study cell division. Mitosis Timeline Virtual Lab. (Mitosis) Introduction: In this lab, you will examine the dividing root-tip cells of an onion. Because of the rapid rate at which onion root tips grow as a result of rapid cell division, it's possible to observe and identify the different stages of mitosis. What are the four major phases of Mitosis, in order? Prophase, Metaphase, Anaphase, and Telophase In what region of the onion root did we look for cells undergoing mitosis?. The Modeling and Microscopic Observation of Mitosis and Meiosis in Plant and Animal Cells Prelab Assignment Before coming to lab, read carefully the introduction and the procedures for each part of the experiment, and then answer the prelab questions at the. Lab Answers: Energy from Burning Food Percentage of cells= (# of cells showing mitosis) /Total cells observed x 100 25% of the cells are in the prophase stage 5% of the cells are in the metaphase stage 5% of the cells are in the anaphase stage 5% of the cells are in the telophase stage 40% of the cells are in a stage of mitosis Conclusion. Big Genetics and Information Transfer 3. The cells you'll be looking at in this activity. What is mitosis? Mitosis is a type of cell division in which one cell (the mother) divides to produce two new cells (the daughters) that are genetically identical to itself. Alliance, OH 44601 − 1812 Employer Central Ohio Oil Referring Provider Dr. MITOSIS AND MEIOSIS LESSON PLAN. Each copy will end up in its own cell at the end of M phase. Students label the image of a cell undergoing mitosis and answer questions about … Cell Cycle Labeling If you teach a class that requires students to memorize information, then you …. The Modeling and Microscopic Observation of Mitosis. specimen to identify the various phases of the cell cycle, to see which phases cells spend. Why are root tips excellent observation points for mitosis? Answers will vary. Alix Pickett Mitosis Lab Answer Sheet. Timing and Length of Lab This investigation requires a minimum of four lab periods of about 45 minutes each, plus time for a discussion on cell cycle control (Part 3). to submit this assignment, students will complete the lab worksheet on pages then upload their completed document as doc or pdf. Mitosis has several steps: prophase, prometaphase, metaphase, anaphase, and telophase ( Figure 2 ). Goal: Predict the length of time that onion cells spend in each phase of the cell cycle. Table 1: Mitosis Predictions. Identify the stage of mitosis shown in the red circle for each numbered image. Introduction: To study mitosis, biologists often look at particular cells. How does mitosis differ in plant cells versus animal cells? a. The process of mitosis begins with prophase. Cell Division iPad Lab ANSWERS Please record the lab name AND iPad unit number in your notebook. Mitosis in an Onion – view picture, identify the stages of mitosis in each of the cells Cell Cycle Label – label a picture of the stages of mitosis, identify parts of the cell such as the centriole and spindle Onion Root Tip Lab – view real cells with a microscope, requires lab equipment and prepared slides Onion and Whitefish – view. animal cells form cleavage that gives way to formation of daughter cells. The video shows excellent images of the major phases of the cell cycle. This is when the cell grows and copies its DNA before moving into mitosis. Explain to your students that in normal cells mitosis is blocked if there is DNA damage. How does mitosis differ in plant cells versus animal cells? a. You will not complete Mitosis Exercise 3. A pair of chromosomes that are the same size, same appearance, and have the same genes. Mitosis is the division of the nucleus and its contents. These regions of growth are good for studying the cell cycle because at any given time, you can find cells that are undergoing mitosis. M phase, which consists of mitosis and cytokinesis, is the portion of the cell cycle where the cell divides, reproducing itself. New cells are formed by the process of cell division which includes both the division of the cell’s nucleus, mitosis, and the division of the cell’s cytoplasm, cytokinesis. Prophase: During this phase, the chromatids and the set of replicated. During mitosis, chromosomes will align, separate, and move into new daughter cells. Mitosis is also a form of asexual reproduction in unicellular eukaryotes. Cell Division (Principles): Mitosis and Meiosis Virtual Lab">Cell Division (Principles): Mitosis and Meiosis Virtual Lab. PDF Cell Cycle Mitosis Interactive Note Taking Sheet and Microscope Lab. Mitosis Virtual Lab Page 1 You will be observing cells going through the process of mitosis in plant cells (Onion Root Tip) and animal cells (Whitefish Blastula). Mitosis is a complex and highly regulated process. This is where the cell divides its previously-copied DNA and cytoplasm to make two new, identical daughter. Both mitosis and meiosis are involved in making new cells; Both start with diploid (2 sets of chromosomes) o Interphase occurs before both, duplicating chromosomes before division o Both mitosis and meiosis go through PMAT (prophase, metaphase, anaphase, telophase) Meiosis goes through PMAT twice (i. CELL CYCLE IDENTIFICATION LAB: Names: Directions: Use the link below to access the slides for today’s lab. Because each cell divides independently of the others, a root tip contains cells at different stages of the cell cycle. The answer is, no, mitosis cannot be used for human reproduction. Onion Root Tip Lab Flashcards. Observing Mitosis Lab Background: In a growing plant root, the cells at the tip of the root are constantly dividing to allow the root to grow. Different chromatids (maternal and paternal) of the same chromosome. Erase the outlines as you go along and re-draw. Every somatic cell undergoes a phase called mitosis. If the diploid number of chromosomes in a cell is 16 and the cell divides by using mitosis, how many chromosomes will be present in each of the new daughter cell s?. Mitosis is the division of the nucleus to form two Hypothesis. replicated chromosomes had 12 beads each, 3 beads on each of the. At the end of mitosis, two daughter cells are formed that are identical to the original (parent) cell. The copying of DNA occurs before mitosis, in the S phase of Interphase. Clayton State University. Provide the correct order for the stages of mitosis. You will not be sub mitting a full lab report, but rather a hypothesis, table, g raph and ans wers to thought-provoking discussion questions. You can use the next slide and previous slide. Each “X” represents a duplicated chromosome. Cell division > The cell cycle and mitosis Mitosis questions This cell is in which stage of mitosis? Choose 1 answer: Early prophase A Early prophase Late prophase (prometaphase) B Late prophase (prometaphase) Metaphase C Metaphase Anaphase D Anaphase Telophase E Telophase Stuck? Review related articles/videos or use a hint. Lab 9 worksheet and answers. The chromosomes line up across the center of the. Note: answers may be. The Cell Cycle & Mitosis Microscope Lab: Interphase, Mitosis, & Cytokinesis Directions: Look under the microscope slides and draw what you see. You must answer all questions below, including the post lab questions. The cell cycle and mitosis review (article). The Cell Cycle & Mitosis The Cell Cycle is the series of. Mitosis Virtual Lab Page 1 You will be observing cells going through the process of mitosis in plant cells (Onion Root Tip) and animal cells (Whitefish Blastula). Mitosis consists of 4 major stages: Prophase, Metaphase, Anaphase, and Telophase. Explain to your students that in normal cells mitosis is blocked if there is DNA damage. Draw a structure for \left (\mathrm {CH}_3 \mathrm {CH}_2 \mathrm {CH}_2\right)_2 \mathrm {CHCH}\left (\mathrm {CH}_2 \mathrm {CH}_3\right)_2. LAb6 biol133 general biology with lab lab assignment mitosis will complete mitosis exercises and will not complete mitosis exercise must answer all questions. From the patient information form: Name Josephine Smith Sex F Birth Date 05 / 04 / 1983 Address 9 Brook Rd. In mitosis, DNA which has been copied in the S phase of interphase is separated into two individual copies. The Cell Cycle & Mitosis The Cell Cycle is the series of events that cells go through as they grow and divide. Mitosis is nuclear division that results in two cells containing the same number of chromosomes as the parent cell. At the end of mitosis, two daughter cells are formed that are identical to the original (parent) cell. Mitosis – Pipe Cleaner Activity">Mitosis – Pipe Cleaner Activity. _ Mitosis Pre-Lab Questions. The blastula is a distinct stage during embryonic development when a fertilized egg forms a hollow ball of cells. Onion Root Cell Cycle Lab Answers. Some textbooks list five, breaking prophase into an early phase (called prophase) and a late phase (called prometaphase). **_*You will complete Mitosis Exercises 1 and 2. (Images are found at link in lab online below where you got this lab report). As completely as possible, list the key events that occur in each stage of mitosis. Because of the rapid rate at which onion root tips grow as a result of rapid cell division, it's possible to observe and identify the different stages of mitosis. Mitosis, Meiosis, and Mendelian Genetics. Chromosomes duplicate (are copied), through the process of DNA replication. It occurs in the following 4 separate. When in the cell cycle and where in the cell does the DNA molecule replicate?. Whitefish Blastula Mitosis Lab Answers. Mitosis, Meiosis, and Mendelian Genetics">Activity #6. Having completed the lab on mitosis, you should be able to: define the following terms: chromosome, spindle, centromere, centrosome, gametes, somatic, cytokinesis, cleavage furrow, homologues (homologous chromosomes), list the stages of the cell cycle in order. Mitosis and Meiosis (revised Fall 2009) Lab 8 - Biol 211 - Page 1 of 24 Lab 8. What are the four major phases of Mitosis, in order? Prophase, Metaphase, Anaphase, and Telophase In what region of the onion root did we look for cells undergoing mitosis? Zone of cell division Are cells undergoing mitosis in the elongation zone of the onion root? No, they are just growing longer in this zone. Erase the outlines as you go along and re-draw the boundaries of nuclei. Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase. Mitosis Digital Lab BIOL133 (1). more time in, and you will answer related analysis questions to further your understanding of the eukaryotic cell cycle. Part 1: Labeling Diagrams Examine the images below. This process is necessary for the normal growth and development of a multicellular eukaryotic organism from a zygote (fertilized egg), as well as growth and the repair and replacement of cells and tissues. The daughter cells separate differently during cytokinesis. A pair of chromosomes that are the same size, same appearance, and have the same genes. Cell Division (Principles): Mitosis and Meiosis Virtual Lab Join a cell biology research group to find out how a poisonous compound from a yew tree can be used in cancer therapy. : Group 2 pipe cleaners of the same color next to each other. Sample answer: The root tip of a plant contains actively dividing cells, making root tips excellent observation points for mitosis. (12 points) A: Interphase_____. Mitosis Digital Lab Answer Sheet. Lab Topic 9 Mitosis. Multiply each number by 1440 (minutes in one day). Introduction: To study mitosis, biologists often look at particular cells. chromatids have 20 beads each, 5 beads on each of the four strands. Remember, that mitosis occurs only in areas of growth, so finding a good spot to study it can be challenging. ##### BIO 101 Lab 09 : Mitosis and Meiosis Worksheet. Mitosis is the division of the nucleus and its contents. Mitosis In Onion Root Tip Cells Lab Answers. It can be predicted that all somatic cells will undergo all the stages of mitosis multiple times in their Materials. Name_____ Section_____ Data Analysis and Synthesis Questions. The rubric for grading is below. My supporting evidence for this claim, is that interphase is the longestphase, and can take up to 18-20 hours. Learning Objectives Having completed the lab on mitosis, you should be able to: define the following terms: chromosome, spindle, centromere, centrosome, gametes, somatic, cytokinesis, cleavage furrow, homologues (homologous chromosomes), list the stages of the cell cycle in order. Divide number of cells in each stage by the total number of cells. Mitosis is also a form of asexual reproduction in unicellular eukaryotes. 52010 Cell Division (Mitosis) Lab 12-2 Exercise #1 — Video of the Cell Cycle In this video, you will see the cell cycle including cell division (cytokinesis) as an entire process with one stage blending into the next, rather than a series of distinct steps. Modeling Mitosis and Meiosis (Activity). At this station, the students will be answering three task cards: What is meiosis and where does it happen? Describe the vocabulary terms, interphase, prophase… How are mitosis and meiosis different? ILLUSTRATE IT!. Compare your list to your classmates. Sawyer, Clayton State University, Morrow GA (2014) Objecives. Mitosis is nuclear division that results in two cells containing the same number of chromosomes as the parent cell. Draw a large circle on the paper to represent the cell and the nucleus with a pencil. Interphase is the longest part of the cell cycle. Most human cells (skin, muscle, bone, etc. chromosomes are lines up beside each other horizontally. Onion Root Cell Cycle Lab Answers Introduction. Introduction: Mitosis is considered nuclear division, since its main stages deal strictly with the nucleus and its contents (DNA). Objective: To explore the stages or phases of mitosis (cell division) necessary to produce genetically identical cells (reproduction resulting in 2 identical "daughter" cells) Materials: iPad with Mitosis app, student notebook, iPad Unit Number. These include: Growing onion root tips Sample preparation Growing onion roots. Mitosis is the division of the nucleus and. Mark Abelman, MD, Family Medicine (NPI 2224567833) Insurance Policy Group Number G0404 Insurance Plan/ Program Name Oxford Choice HMO Member ID 610327842 X Assignment of Benefits Y Signature on File Y Encounter. Explain to your students that in normal cells mitosis is blocked if there is DNA damage. Every somatic cell undergoes a phase called mitosis. Sawyer, Clayton State University, Morrow GA (2014) Objectives. The Modeling and Microscopic Observation of Mitosis …. Verified answer. Lab Background: Mitosis is the mechanism by which the chromosomes of eukaryotes are segregated so that the two daughter cells formed by cell division receive the same number of chromosomes that the parent cell contained. What is happening to the nucleus of the cell during prophase? The nuclear membrane disappears and the chromosomes thicken & begin to organize themselves 5. Thus, all daughter cells formed by mitosis have an identical set of genes. Students label the image of a cell undergoing mitosis and answer questions about … Cell Cycle Labeling If you teach a class that requires students to memorize information, then you …. Two specimens are commonly used by biologists to study mitosis: the blastula of a whitefish and the root tip of an onion. At what stage do chromosomes become visible? Chromosomes become visible during prophase. Cell division > The cell cycle and mitosis Mitosis questions This cell is in which stage of mitosis? Choose 1 answer: Early prophase A Early prophase Late prophase (prometaphase) B Late prophase. Experiment For this section, the experiment will be divided into two main parts. What are chromosomes made of? (10 points) They are made up of proteins and DNA that is organized into genes which code for traits. However, both processes are part of the larger cell cycle, where interphase consists of the G _1 1 , S, and G _2 2 stages of the cell cycle. The stage in the cell cycle where the cell is growing, replicating (copying) its DNA, and performing basic cell functions. In order to examine cells in the tip of an onion root, a thin slice of the root is placed onto a microscope slide and stained so the chromosomes will be visible. PDF Cell Division iPad Lab ANSWERS. Observing Mitosis Lab Background: In a growing plant root, the cells at the tip of the root are constantly dividing to allow the root to grow. The 3rd phase of Mitosis. Steps to calculating time for phases. How many divisions does mitosis have? 1 How many divisions do meiosis have? 2 Mitosis produces how many cells? 2 genetically identical daughter cells Meiosis produces how many cells? 4 genetically different daughter cells. Jan 24, 2020. Mitosis are divided into four phases: prophase, metaphase, anaphase,& telophase Centrioles Chromatin Nucleolus Nuclear envelope 5Chromosome 6Sister chromatids 7 Spindle fiber 8CentrosomeInterphase is divided into three phases: G1,S, & G2Interphase is the in between stages of cell division. Mitosis and Meiosis (revised Fall 2009) Lab 8 - Biol 211 - Page 1 of 24 Lab 8. Prophase Metaphase Anaphase Telophase. The last phase and is prophase in reverse. Mitosis: Use Oreos to model. The process of mitosis, or cell division, is also known as the M phase. Hypothesis: Think about your learning on mitosis and the cell cycle so f ar. More than 50% of human cancers have loss of p53 function; this protein blocks mitosis if there is DNA damage. Why are root tips excellent observation. Part 1: Labeling Diagrams Examine the images below. Determine the shear stress at points C C C and D D D located on the web of the beam.