Biology with Connect Access Card
Biology with Connect Access Card
10th Edition
ISBN: 9780077705701
Author: Raven, Peter
Publisher: McGraw-Hill Education
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Chapter 11, Problem 1U

In comparing somatic cells and gametes, somatic cells are

a. diploid with half the number of chromosomes.

b. haploid with half the number of chromosomes.

c. diploid with twice the number of chromosomes.

d. haploid with twice the number of chromosomes.

Expert Solution & Answer
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Summary Introduction

Introduction:

Somatic cells or body cells are diploid cells containing two sets of a chromosome. Somatic cells are formed by the process of mitosis while gametes or germ cells are formed by the process of meiosis. Gametes formation occurs by the fusion of egg and sperm cells during meiosis.

Answer to Problem 1U

Correct answer:

On comparing somatic cells and gametes, somatic cells are diploid with twice the number of chromosomes. Therefore, option c is correct.

Explanation of Solution

Reason for the correct statement:

Somatic cells contain 46 chromosomes and are diploid (consisting of a pair of 23 chromosomes) in nature. On the other hand, the gametes contain only half of the chromosomes (only 23 chromosomes) and thus, each gamete is a haploid.

Option c. is given as “diploid with twice the number of chromosomes.”

As “Somatic cells contain two sets of chromosomes, they are said to be diploid. Gametes contain only one set of chromosomes and they are said to be haploid. Gametes are the sex cells (egg and sperm cells) that undergo meiosis, whereas somatic cells are the body cells that undergo mitosis. Somatic cells are diploid cells with twice the number of chromosomes”. Hence, it is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “diploid with half the numbers of chromosomes”.

On comparing the somatic cells with gametes, somatic cells are diploid in nature and contain twice the number of chromosomes. Therefore, it is the wrong answer.

Option b. is given as “haploid with half the number of chromosomes”.

The somatic cells are diploid cells that have twice the number of chromosomes in comparison to gametes. Therefore, it is the wrong answer.

Option d. is given as “haploid with twice the number of the chromosomes”.

On comparing the somatic cells with the gametes, somatic cells have twice the numbers of chromosomes (46chromosomes) and it is diploid in nature. Therefore, it is the wrong answer.

Hence, options a., b. and d. are incorrect.

Conclusion

Conclusion:

Somatic cells contain twice the numbers of chromosomes and are diploid in nature, while gametes are the sex cells and are haploid in nature that contain half the number of chromosomes.

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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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