Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 9, Problem 9RQ
Summary Introduction
To review:
The crossing over and in the stage wherein it occurs and also the two functions of chiasmata.
Introduction:
Cell division refers to the method by which the parent cell segregates itself into two or more daughter cells. This division usually takes place as a section of a larger cell cycle and in eukaryotes, it is segregated into vegetative and reproductive cell division. Vegetative is known as mitosis while reproductive cell division is known as meiosis.
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If nondisjunction occurs during meiosis I, how many of the daughter cells will have an incorrect number of chromosomes after meiosis I and meiosis II are complete?
4
2
1
3
Draw a simple sketch illustrating how nondisjunction in meiosis can lead to Down syndrome.
explain how Errors in meiosis cause aneuploidy.
Chapter 9 Solutions
Biology: Life on Earth
Ch. 9 - Fill-in-the-Blank The genetic material of all...Ch. 9 - Fill-in-the-Blank Genetically identical offspring...Ch. 9 -
2. Prokaryotic cells divide by a process called...Ch. 9 - Growth and development of eukaryotic organisms...Ch. 9 - Fill-in-the-Blank Most plants and animals have...Ch. 9 - The four phases of mitosis are _______, _______,...Ch. 9 - Prob. 7FTBCh. 9 - Prob. 8FTBCh. 9 - Fill-in-the-Blank During__________ of meiosis I,...Ch. 9 - Fill-in-the-Blank Three processes that promote...
Ch. 9 - Prob. 1RQCh. 9 - Prob. 2RQCh. 9 -
2. Define mitosis and cytokinesis. What changes...Ch. 9 - Diagram the stages of mitosis. How does mitosis...Ch. 9 - Define the following terms: homologous chromosome...Ch. 9 -
5. Describe and compare the process of...Ch. 9 - How is the cell cycle controlled? Why is it...Ch. 9 - Diagram the events of meiosis. At which stage do...Ch. 9 - Prob. 9RQCh. 9 - In what ways are mitosis and meiosis similar? In...Ch. 9 - Describe or diagram the three main types of...Ch. 9 - Describe how meiosis provides for genetic...Ch. 9 - Most nerve cells in the adult human central...Ch. 9 - Cancer cells divide out of control. Side effects...Ch. 9 - Some animal species can reproduce either asexually...
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- Discuss the following sets of terms: a. trisomy and triploidy b. aneuploidy and polyploidyarrow_forwardNondisjunction can be caused by ________. a. crossing over in meiosis b. segregation in meiosis c. failure of chromosomes to separate during meiosis d. multiple independent assortmentsarrow_forwardGenes on the same chromosome tend to stay together during _____ and end up in the same ______. a. mitosis; body cell b. mitosis; gamete c. meiosis; body cell d. meiosis; gamete e. both a and darrow_forward
- Describe the process of meiosis (meiosis I and meiosis 2) and Explain the differences between meiosis and mitosis Identify at which stage crossing over occursarrow_forwardDescribe the events taking place during meiosis? What are the different phases? What is the chromosomal content of the final product? Why must this occur to make a chromosomally viable human?arrow_forwardCan I see the full diagram for the mitosis and meiosis drawing? And how to do it? The one posted only shows the first photoarrow_forward
- Identify two ways meiosis contributes to genetic recombination? Why is it necessary to reduce the number of chromosomes in gametes? Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: Cachalot whale Egg cell Daughter cell from mitosis Daughter cell from mitosis IIarrow_forwardExplain the process of the following: a. The normal segregation of chromosomes during Meiosis 1 and Meiosis 2 in MALE. b. The abnormal segregation of chromosomes during Meiosis 1 and Meiosis 2 in FEMALE.arrow_forwardExplain the genetic consequences of chromosomal configuration at different stages of meiosis.arrow_forward
- In a cell that has just begun the process of meiosis, as shown, what is the probability that a resulting gamete will have only maternally inherited chromosomes? (blue chromosomes are paternally inherited, red are maternally inherited) a) 1/4 b) 1/2 c) 1/8 d) 1/16 e) 1/32arrow_forwardBriefly illustrate how nondisjunction in meiosis can result in Down syndrome.arrow_forwardWhat is the importance of chromosomal crossover events during meiosis I? Explain in a detailed manner.arrow_forward
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