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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Students have asked these similar questions
After fertilisation, the resulting cell which gives rise to a new individual is the: (a) embryo (b) ovum (c) foetus (d) zygote
What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? a. The cells would not continue to divide. b. The corpus luteum would continue to produce progesterone and estrogen. c. Menses would flush the blastocyst out of the uterus. d. The uterine mucosa would not envelop the blastocyst.
Why is a second polar body expelled after fertilisation?  a)   To remove excess cytoplasm  b)   Because the oocyte must reactivate the incomplete meiosis before fusing with the sperm  c)   Before fusion with the sperm it must complete mitosis  d)   The fertilised oocyte is not a haploid cell until it expels the sperms mitochondria
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