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Biology: The Dynamic Science (Mind...

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

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

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

In mammalian development:

a. the morula develops into a trophoblast.

b. the chorionic villi allow the blastocyst to move down theoviduct.

c. the allantois takes over the work of the amnion.

d. the pharyngeal arches transform into the pharynx, larynx, and nasal cavities.

e. prolactin stimulates parturition.

Summary Introduction

Introduction:

In mammals, the embryonic development involves nourishment of the embryo by the placenta. This placenta is responisble for supplying nutrients and oxygen to the embryo, and carrying away the nitrogenous waste and carbon dioxide.

Explanation

Justification/explanation for the correct answer:

Option (d) states that the pharyngeal arches transform into pharynx, larynx and nasal cavities. The mammalian embryo (represented by human) becomes 3–5 millimeters long by the end of the 4th week. The embryo develops a tail and pharyngeal arches. These pharyngeal arches contribute to the formation of neck, face, mouth, pharynx, and larynx. The neck, face, and mouth are the nasal cavity. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) states that morula develops into trophoblast. The trophoblast is the outermost single layer of the blastocyst. Blastocyst develops from the morula, which forms the trophoblast. So, it is an incorrect option.

Option (b) states that the chorionic villi allow the blastocyst to move down the oviduct...

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