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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 the development of the female sex organs:

a. all ducts in the 7-week embryo become Wolffian ducts.

b. the SRY gene is activated.

c. anti-Müllerian hormone is secreted.

d. the Müllerian ducts develop into oviducts.

e. the mother secretes oxytocin.

Summary Introduction

Introduction:

The development of sex organs, male or female, depends on the presence or absence of Y-chromosome. The develop of gonads begin in the 4th week of gestation. By the 7th week of gestation, the gonads have structures, which are common in both male and female embryo. The gonads are bipotential and can develop into a male or female gonad. This is decided by the presence of the Y-chromosome.

Explanation

Justification/explanation for the correct answer:

Option (d) states that the Mullerian ducts develop into oviducts. When the fetus lacks the Y-chromosome, the bipotential gonad and internal ducts develop into female gonads. The absence of Y-chromosome results in the absence of SRY protein, which is the sex-determining region of the Y-chromosome. The presence of progesterone and estrogen secreted by the placenta helps in the development of ovaries. The Mullerian duct then forms oviduct, parts of the vagina, and uterus. The external female genitalia development is stimulated by the female sex hormones. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) states that all ducts in 7th week embryo become Wolffian ducts. The Wolffian ducts are formed only in the presence of testosterone. These hormones are secreted only in male embryos...

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