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Exam 7: Development and Sex Determination

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Question 31

Multiple Choice

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Teratogens affect the ____ more than any other part of the fetal body.

A) central nervous system
B) upper limbs
C) heart
D) lower limbs
E) external genitalia

F) A) and D)
G) A) and C)

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Question 32

Multiple Choice

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The phenotypic sex depends most directly on

A) the presence of a Y chromosome.
B) the presence of the number of active X chromosomes.
C) the development of the ovaries.
D) the influence of hormones.
E) the degeneration of the Müllerian duct.

F) A) and E)
G) A) and D)

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Question 33

Multiple Choice

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The part of the male reproductive system where sperm complete fertilization is the

Distinguish between sex determination and sex differentiation.

X inactivation can lead to ____________________ in females.

The result of X inactivation is ____________________ between the sexes.

In the male reproductive system, the vas deferens is connected to the urethra by a short tube called the ____________________.

The duct between a testis and a seminal vesicle is the ____________________.

DHT is less important in the fetal stage than at puberty.

The phenotypic sex of a child depends on

The fusion of male and female gametes usually occurs in the upper third of the vagina.

Typically, blastocyst implantation in the uterus takes place at day ___.

Explain how X inactivation can result in female mosaicism.

Implantation of an embryo normally has occurred by how long after fertilization?

Think about this: It has been proven absolutely that a certain chemical can never pass through the placenta from the mother's circulation into the fetus's circulation. Is it still possible for this chemical to be a teratogen? Why or why not?

The embryonic genital tubercle that develops into part of the penis in male fetuses develops into the ____________________ in female fetuses.

What is the function of polar bodies?

The limb deformities caused by the tranquilizer ____________________ helped focus attention on the issue of teratogens.

The lower neck of the uterus, which opens into the vagina, is called the ____________________.