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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Place these events in human development in the correct order.

____ 1 a. gastrulation is completed
____ 2 b. blastocyst forms
____ 3 c. tail is reabsorbed
____ 4 d. implantation occurs
____ 5 e. zygote forms
____ 6 f. neural tube forms
____ 7 g. maternal cervix softens

Summary Introduction

To place: The events in human development in the correct order.

Explanation

1 - e. zygote forms

The gametogenesis occurs in males and females. Males produce sperms and Females produce eggs. During intercourse between a male and female, the male’s sperms are ejaculated into the female reproductive tract. In the oviduct, fertilization takes place. The gametes unite and form the zygote.

2- b. blastocyst forms

The zygote undergoes continuous mitotic divisions that lack G phase and forms the blastocyst. The blastocyst is made up of cells called as blastomeres, its outer covering is called as blastoderm and a cavity that is present inside is called as blastocoel.

3- d. implantation occurs.

The blastocyst travels from the oviducts and reaches the uterus where it embeds into the wall of the uterus called as implantation.

4- a.gastrulation is completed

Post implantation, the blastocyst undergoes gastrulation to form the gastrula...

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