Concepts of Genetics (12th Edition)
Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 2, Problem 1NST

With the initial appearance of the feature we call “Now Solve This,” a short introduction is in order. The feature occurs several times in this and all ensuing chapters, each time providing a problem related to the discussion just presented. A “Hint” is then offered that may help you solve the problem. Here is the first problem:

  1. (a) If an organism has a diploid number of 16, how many chromatids are visible at the end of mitotic prophase?
  2. (b) How many chromosomes are moving to each pole during anaphase of mitosis?

(a)

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Summary Introduction

To determine: The number of chromatids that are visible at the end of prophase stage of mitosis.

Introduction: Mitosis is a process of division in which two daughter cells produce, and each daughter cell has the same complement of chromosomes as the parent cell.

Explanation of Solution

Prophase is the first stage of mitosis. In this stage, chromatin fibers start to condense, and nuclear envelope disappears, and centrioles divide. As chromatin fibers condense, the thread-like structures, the chromosomes, become visible.

It becomes apparent near the end of prophase that each chromosome consists of two parts, which are called sister chromatids. For example, if an organism has diploid number of 16 chromosomes, 32 chromatids would be visible at the end of mitotic prophase.

(b)

Expert Solution
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Summary Introduction

To determine: The number of chromosomes that move towards the opposite poles during anaphase.

Introduction: Mitosis is divided into several stages: prophase, prometaphase, metaphase, anaphase, and telophase.

Explanation of Solution

In metaphase, the homologous chromosomes duplicate. Anaphase is the shortest stage of mitosis. The events critical to chromosome distribution occur during this stage. In this stage, sister chromatids of each chromosome disjoin from one other and are pulled towards opposite ends. This event is described as disjunction. If an organism has a diploid number of 16 chromosomes, 16 chromosomes will move towards the opposite poles during anaphase.

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Chapter 2 Solutions

Concepts of Genetics (12th Edition)

Ch. 2 - If two chromosomes of a species are the same...Ch. 2 - Describe the events that characterize each stage...Ch. 2 - How are chromosomes named on the basis of their...Ch. 2 - Contrast telophase in plant and animal mitosis.Ch. 2 - Describe the phases of the cell cycle and the...Ch. 2 - Define and discuss these terms: (a) synapsis, (b)...Ch. 2 - Contrast the genetic content and the origin of...Ch. 2 - Given the end results of the two types of...Ch. 2 - Contrast spermatogenesis and oogenesis. What is...Ch. 2 - Explain why meiosis leads to significant genetic...Ch. 2 - A diploid cell contains three pairs of homologous...Ch. 2 - Considering Problem 15, predict the number of...Ch. 2 - During oogenesis in an animal species with a...Ch. 2 - What is the probability that, in an organism with...Ch. 2 - The nuclear DNA content of a single sperm cell in...Ch. 2 - Describe the role of meiosis in the life cycle of...Ch. 2 - Contrast the chromatin fiber with the mitotic...Ch. 2 - Describe the folded-fiber model of the mitotic...Ch. 2 - Prob. 23PDQCh. 2 - If one follows 50 primary oocytes in an animal...Ch. 2 - In mitosis, what chromatid combination(s) will be...Ch. 2 - During meiosis I, assuming no crossing over, what...Ch. 2 - Are there any possible combinations present during...Ch. 2 - Draw all possible combinations of chromatids...Ch. 2 - Assume that during meiosis I none of the C...Ch. 2 - Assume that each gamete resulting from Problem 29...Ch. 2 - A species of cereal rye (Secale cereale) has a...Ch. 2 - An interesting procedure has been applied for...Ch. 2 - Assume that you were examining a first polar body...Ch. 2 - Kuliev and Verlinsky (2004) state that there was a...

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