Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The secondary oocyte in humans is fertilized in the:

a. uterus.

b. vagina.

c. oviduct.

d. cervical canal.

e. ovary.

Summary Introduction


Stages of sexual reproduction include the release of oocytes, immobilization of secondary oocyte, fertilization, development by providing nutrition, and other factors; and finally giving birth to an individual. The secondary oocyte waits in the oviduct at a certain place to be fertilized by the sperms. This is highly subjected to the probability of sperms being able to fertilize the egg.


Justification/explanation for the correct answer:

Option (c) is given as oviduct. The oviduct or the fallopian tube is where the secondary oocyte is fertilized by the sperm. The secondary oocyte moves from the ovary into the ampulla of the fallopian tube. The secondary oocyte stays in the ampulla for about 2–3 days, and degenerates if not fertilized. Hence, option (c) is correct.

Explanation for the incorrect answers:

Option (a) is given as uterus. The oviducts, which carry the egg or the secondary oocyte, join the uterus. The uterus prepares the endometrium for the implantation of the egg if fertilization occurs. If unfertilized, the layers of endometrium shed off. So, it is an incorrect option.

Option (b) is given as vagina...

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