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Human Biology (MindTap Course List)

11th Edition
Cecie Starr + 1 other
Publisher: Cengage Learning
ISBN: 9781305112100

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Chapter
Section
BuyFindarrow_forward

Human Biology (MindTap Course List)

11th Edition
Cecie Starr + 1 other
Publisher: Cengage Learning
ISBN: 9781305112100
Chapter 17, Problem 6SQ
Textbook Problem
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In a human zygote, the cell divisions of cleavage produce an embryonic stage known generally as a _______.

  1. a. zona pellucida
  2. b. gastrula
  3. c. blastocyst
  4. d. larva

Summary Introduction

Introduction: Gestation or pregnancy is the period during which the offspring develops within the uterus of a sexually mature woman. This involves several developmental stages of the fetus. In humans, pregnancy is nearly nine months long, divided into three trimesters, involving several changes in the mother and the growing fetus.

Explanation of Solution

Reason for the correct answer:

The sperm fertilizes the egg and then, the zygote is formed. The zygote undergoes cleavage to form the blastocyst. The blastocyst is implanted in the uterus. The outermost cells of the blastocyst and the wall of the uterus help to give rise to a few extraembryonic membranes. The placenta consists of two layers. The outer layer is contributed by the outer layer of blastocysts and the inner layer is contributed by the maternal endometrium.

Option c. is given as “Blastocyst”.

Zygote (single cell after fertilization) multiplies into a multicellular structure called as a blastocyst and after the implantation it is termed as an embryo.

Hence, the correct answer is option c.

Reasons for incorrect answers:

Option a. is given as “Zona pellucida”...

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