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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 7, Problem 4QP
Textbook Problem
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A Survey of Human Development from Fertilization to Birth

4. The gestation of a fetus occurs over 9 months and is divided into three trimesters. Describe the major events that occur in each trimester. Is there a point at which the fetus becomes more “human”?

Summary Introduction

To determine: The major events that occur during each trimester in the gestation of a fetus over a period of nine months.

Introduction: Humans reproduce by sexual reproduction. The male gametes are known as sperms and the female gametes are known as eggs. Gonads are the organs where the male and the female gametes are produced. The male gametes are produced with the help of male sex hormones called androgens and the female gametes are produced with the help of female sex hormones called estrogens. The process of production of the zygote is referred to fertilization.

Explanation of Solution

The development of a fetus begins from fertilization and it is divided into three trimesters from fertilization to birth. Every trimester is about 12 to 13 weeks long.

The major events occurring during each trimester are as follows:

  • First trimester

    The most important events such as organ formation take place during the first trimester of embryo development. The size, shape, and the complexity of the embryo change radically during the first trimester. Major organs systems such as the heart are formed during this trimester. The rapid development of the brain and the nervous system takes place, and the limb buds give rise to arms and legs. The fetus is 9 cm in length and has around 15 g weight by the end of the first trimester.

  • Second trimester

    The second trimester is mainly called the period of organ maturation. The formation of the skeleton takes place during this trimester. The fetus’s arms and legs begin to move in this trimester...

Summary Introduction

To determine: The point at which the fetus becomes more ‘human”.

Introduction: Humans reproduce by sexual reproduction. The male gametes are known as sperms and the female gametes are known as eggs. Gonads are the organs where the male and the female gametes are produced. The male gametes are produced with the help of male sex hormones called androgens and the female gametes are produced with the help of female sex hormones called estrogens. The process of production of the zygote is called fertilization.

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