Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 16.1, Problem 1CC
Summary Introduction
To explain:
The reason why humans are not composed of similar or identical cells in spite of being a product of many mitotic divisions.
Introduction:
Mitosis is a type of cell division, which results in the formation of two identical daughter cells. It only occurs in vegetative cells and the ploidy of the cells remains the same. So, it is also called equational division. The whole process of mitosis completes in four phases, namely, prophase (I phase), metaphase (II phase), anaphase (III phase), and telophase (IV phase).
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MAKE CONNECTIONS Look at Figure 12.7 and imagine the twodaughter cells undergoing another round of mitosis, yielding four cells.Compare the number of chromosomes in each of those four cells, aftermitosis, with the number in each cell in Figure 13.8, after meiosis. Whatis it about the process of meiosis that accounts for this difference, eventhough meiosis also includes two cell divisions?
Q1: Do all cells in an organism enter each stage of mitosis at the same time? (Hint: See image of onion root tip at far left in the figure.) Q2: What happens between the end of interphase and early prophase that changes the appearance of the chromosomes? Q3: Explain in your own words the role of the mitotic spindle in mitosis.
Let’s model mitosis. Focus on drawing the cell nucleus taking care to model the number and location of chromosomes. Although the chromosomes are only visible in each stage, draw them in all stages for clarity sake.
Draw a 2n=4 cell at G1 of interphase.
Draw the same cell at the start of prophase.
Draw the same cell at metaphase.
Draw the cell(s) that result at the end of cytokinesis.
Chapter 16 Solutions
Campbell Biology in Focus (2nd Edition)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A diploid nucleus at early mitotic prophase has __________ set(s) of chromosomes; a diploid nucleus at mitotic telophase has __________ set(s) of chromosomes. (a) 1; 1 (b) 1; 2 (c) 2; 2 (d) 2; 1 (e) not enough information has been givenarrow_forwardTest Your Understanding 2. At which of the following stages do human skin cell nuclei have the same DNA content? (a) early mitotic prophase and late mitotic telophase (b) G1 and G2 (c) G1 and early mitotic prophase (d) G1 and late mitotic telophase (e) G2 and late mitotic telophasearrow_forwardThe molecular tether that links sister chromatids of a duplicated chromosome to each other is (a) condensin (b) actin (c) myosin (d) cohesin (e) actomyosinarrow_forward
- CONNECT Does the DNA content of the cell change from the beginning of interphase to the end of interphase? Does the number of chromosomes change? Explain.arrow_forwardTask: Show your work/explain your reasoning as much as possible. If a certain species has a DNA content of 12 picograms in each diploid cell's nucleus when the cell in in G1 of the cell cycle, what would be the expected DNA content (in picograms) of a triploid cell (from the same species) in mitotic prophase? Consider ploidy changes and/or chromosome form changes, if applicable, when explaining your reasoning.arrow_forwardCompare Mitosis and Meiosis after watching these videos: Cell Cycle, Mitosis and Meiosis https://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-the-cell-cycle-and-mitosis/v/mitosis Mitosis (video) | The cell cycle and mitosis | Khan Academy Mitosis is how cells divide! Learn what happens in all the phases of mitosis: prophase, metaphase, anaphase, and telophase. www.khanacademy.org https://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-meiosis/v/phases-of-meiosis-i Phases of meiosis I (video) | Meiosis | Khan Academy How homologous chromosomes separate into two sets. Prophase I, metaphase I, anaphase I, and telophase I. www.khanacademy.org https://www.khanacademy.org/science/biology/cellular-molecular-biology/meiosis/v/comparing-mitosis-and-meiosis?modal=1 Comparison Mitosis vs. Meiosis: Side by Side Comparison Mitosis vs Meiosisarrow_forward
- Normal events in mitosis gives rise to daughter cells with exactly the same chromosome number and genetic material. What may be expected to happen chromosomally and genetically to: 1. an unfertilized egg that undergoes mitosis, but fails to undergo cytokinesis? 2. a cell with a chromosome that lost its centromere? 3. a cell with a chromosome that contains two centromeres?arrow_forwardWhat is a chromosome? How many chromosomes are in humans? 2.- What are the phases of the cell cycle? Why are important? 3.- a: What is the interphase ? b: Please explain the phases of the interphase. 4.- Why the cells are capable to maintain the homeostasis? 5.- Please name the organelles in the cell, and explain Golgi Apparatus, and Nucleolus: __________________.arrow_forwardTask: Show your work/explain your reasoning as much as possible. Grading Criteria: I want the correct answer and I want to see your work or read an explanation of your reasoning. Question: If a certain species has a DNA content of 5 picograms in each diploid cell's nucleus when the cell in in G1 of the cell cycle, what would be the expected DNA content (in picograms) of a diploid cell (from the same species) in mitotic prophase? Explain your reasoning. Consider ploidy changes and/or chromosome form changes, if applicable, when explaining your reasoning.arrow_forward
- Task: Show your work/explain your reasoning as much as possible Grading Criteria: I want the correct answer and I want to see your work or read an explanation of your reasoning. Question If a certain species has a DNA content of 12 picograms in each diploid cell's nucleus when the cell in in G1 of the cell cycle, what would be the expected DNA content (in picograms) of a triploid cell (from the same species) in mitotic prophase? Consider ploidy changes and/or chromosome form changes, if applicable, when explaining your reasoning.arrow_forwardCount 100 cells and tally them. Remember the phases you learned in Bio 31 and Anatomy? Draw a pie chart graph showing the phases of Allium root tip. Label each of the phases with the % for each phase: prophase metaphase anaphase telophase interphase provide direction of the phase progression--direction in which to read the graph so the phases of mitosis are in proper order.arrow_forwardIn the tracking chromosomal DNA movement through mitosis experiment, how many chromosomes did each of your daughter cells contain? Why is it important for each daughter cell to contain information identical to the parent cell? How often do human skin cells divide? Why might that be? Compare this rate to how frequently human neurons divide. What do you notice?arrow_forward
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The Cell Cycle and its Regulation; Author: Professor Dave Explains;https://www.youtube.com/watch?v=eqJqhA8HSJ0;License: Standard YouTube License, CC-BY
Cell Division - Mitosis and Meiosis - GCSE Biology (9-1); Author: Mr Exham Biology;https://www.youtube.com/watch?v=w7vp_uRA8kw;License: Standard YouTube License, CC-BY