Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 10.4, Problem 1HYEW
Summary Introduction

To explain:

The reason behind the sterility of mules.

Introduction:

Reproduction is a way of maintaining the continuity of race. The reproduction can be asexual or sexual. The sexual reproduction involves two different parents. Each of the parents forms gametes, which at the time of fertilization fuses and leads to the formation of zygote which is genetically different from both the parents.

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A prairie grass species called "little bluestem" is tetraploid. It has four complete sets of chromosomes. There are ten kinds of chromosomes; in other words, each complete set of chromosomes has a total of 10 chromosomes. A single somatic cell (e.g., a cell in a leaf) will have 40 chromosomes, 4 of each kind of chromsome, i.e., 4 of the number 1 chromsome, 4 of the number 2 chromsome, etc.  The illustration below shows prophase of meiosis 1 in chromosome number 10. In a diploid cell, there would be one tetrad (group of 4 chromatids) for each kind of chromosome.  For example, there would be one tetrad for chromosome 8, one for chromsome 9, etc.  When the tetraploid little bluestem undergoes meiosis, how many of chromosome number 10 will each sperm cell carry?
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