Laboratory Manual For Human Anatomy & Physiology
Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159363
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: McGraw-Hill Publishing Co.
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Textbook Question
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Chapter 61, Problem 1PL

The ovum and sperm unite and form a diploid cell called the
a. pronucleus.
b. blastocyst.
c. morula.
d. zygote.

Expert Solution & Answer
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Summary Introduction

Introduction

Sperm is a male sex cell develop in testis during spermiogenesis where ovum is female sex cell produced in the ovary. Diploid cell means a cell containing two sets of chromosomes where haploid contain a half number of chromosomes.

Answer to Problem 1PL

Correct answer

The correct answer is an option (d) The ovum and sperm unite and form a diploid cell called the zygote.

Explanation of Solution

Explanation/justification for the correct answer:

Option (d) The ovum and sperm unite and form a diploid cell called the zygote. when sperm fertilized with female gamete i.e. ovum it becomes a zygote. Sperm and ovum are haploid cells when it fuses together it becomes a diploid cell. So, the correct answer is an option (d).

Explanation for incorrect answer

Option (a) The ovum and sperm unite and form a diploid cell called the pronucleus. Pronucleus is actually sperm or nucleus before fertilization. So, this is an incorrect option.

Option (b) The ovum and sperm unite and form a diploid cell called the blastocyst. The blastocyst is the early development of an organism. So, this is an incorrect answer.

Option (c) The ovum and sperm unite and form a diploid cell called a morula. This option is incorrect because it is an earlier stage of the embryo. So this option is incorrect.

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Which of the following structures develops into only the fetus?   a. Inner cell mass b. Trophoblast c. Blastocyst d. Zygote
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