BIOLOGY-ACCESS >I<
BIOLOGY-ACCESS >I<
14th Edition
ISBN: 9781264419531
Author: Mader
Publisher: MCG
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Chapter 10, Problem 1TC
Summary Introduction

To explain:

The reason that the first meiotic division considered to be the reduction division for chromosome number.

Introduction:

Meiosis is a process of cell division in which four haploid daughter cells are produced. It is also known as a reductional division because the daughter cells receive the reduced number of chromosomes. Meiosis is important for the reproduction because it produces haploid gametes. Meiosis occurs in two stages meiosis I and meiosis II.

Expert Solution & Answer
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Explanation of Solution

The meiosis I produce daughter cells that contain half the number of duplicated chromosomes because it separates the “homologous chromosomes” to produce daughter cells that are haploid. So, the daughter cells receive one chromosome from each homologous pair.

This is due to the events that takes place in the anaphase I where sister chromatids are together even after the pull from the spindle fibers. Such meiotic divisions produce haploid gametes in humans.

Conclusion

The first meiotic division considered to be the reduction division for chromosome number because it separates the homologous chromosomes to produce haploid daughter cells.

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After you feel comfortable with your counting method and identifying cells in the various stages of mitosis, use the four images below of whitefish blastula to count the cells in each stage until you reach 100 total cells, recording your data below in Data Table 1. (You may not need to use all four images. Stop counting when you reach 100 total cells.) After totaling the cells in each stage, calculate the percent of cells in each stage. (Divide total of stage by overall total of 100 and then multiply by 100 to obtain percentage.)   Data Table 1Stage    Totals    PercentInterphase        Mitosis:        Prophase        Metaphase        Anaphase        Telophase        Cytokinesis        Totals    100    100% To find the length of time whitefish blastula cells spend in each stage, multiply the percent (recorded as a decimal, in other words take the percent number and divide by 100) by 24 hours. (Example: If percent is 20%, then Time in Hours = .2 * 24 = 4.8) Record your data in Data…
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