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Mammalian Sexual Differentiation

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Questions and Answers

What is the primary function of the SRY gene?

Determining the sex chromosomes X and Y

Initiating the transcription of genes necessary for testicular differentiation (correct)

Facilitating the delivery of the fetus during pregnancy

Inhibiting the secretion of follicle-stimulating hormone (FSH)

Which hormone is secreted by the ovaries during pregnancy to facilitate delivery?

Relaxin (correct)

Estrogen

Inhibin B

Progesterone

What determines the sex of an individual in humans?

The presence or absence of the X chromosome

The combination of X and Y chromosomes (correct)

The secretion of estrogen and androgen hormones

The presence or absence of the Y chromosome

Which hormone is secreted by both the ovaries and adrenal cortex in both sexes?

Androgen (B) Signup and view all the answers

Which statement best describes the primary factors responsible for the differences between males and females in most mammalian species?

The differences depend primarily on a single chromosome (the Y chromosome) and a single pair of endocrine structures (testes in males and ovaries in females). (B) Signup and view all the answers

What is the primary function of inhibin B?

Inhibiting the secretion of follicle-stimulating hormone (FSH) (A) Signup and view all the answers

What determines the differentiation of the primitive gonads into testes or ovaries in utero in humans?

It is genetically determined. (A) Signup and view all the answers

What is responsible for male sexual behavior and, in some species, the male pattern of gonadotropin secretion?

The action of male hormones on the brain in early development. (B) Signup and view all the answers

What causes the appearance of features typical of the adult male or female and the onset of the sexual cycle in the female after birth?

Hormones secreted by the gonads at adolescence, activated by gonadotropins from the anterior pituitary. (C) Signup and view all the answers

What happens to gonadal function in human females and males as they age?

In females, ovarian function remains unchanged with advancing age. In males, gonadal function slowly declines with advancing age, but the ability to produce viable gametes persists. (A) Signup and view all the answers