Chapter 11:Organizing Effects Of Hormones

Question 1

Main effect of Y chromosome is through:

Answer 1

SRY gene

Question 2

SRY Gene

Answer 2

Sex determining region of the Y chromosome gene

Intronless gene that encodes the SRY protein[a transcription factor ]

Question 3

What is the result of SRY protein activation of genes?

Answer 3

Production of androgens

Question 4

High androgen levels in male embryo:

Answer 4

Development of male genitals: mullarian duct, wulffian duct )

Male bran traits: larger sexually dimorphic nucleus of the hypothalamus; growth of spinal nucleus of bulbocavernosis

Question 5

Low and then levels in embryo cause:

Answer 5

Development of female genitals(mullarian duct degenerates, wulffian duct develops)

And female brain traits

Question 6

Do hormones on early brain development influence adult behavior?

Answer 6

Absolutely including traits like aggression, sexual behavior, parental behavior

Question 7

2 intersex syndromes caused by disruption of organizing effects of hormones in early development:

Answer 7

Congenital adrenal hyperplasia

Androgen insensitivity syndrome

Question 8

Congenital adrenal hyperplasia

Answer 8

Overproduction of adrenal androgens from early fetal life.

Little girls are behaviorally “masculinization” by this

Toy preference

Question 9

Androgen insensitivity syndrome

Answer 9

Somone who is genetically male but resistant to androgens.

As a result, the person has some or all physical traits of a woman but the genetic makeup of a man

Question 10

What is the only sex difference upon fertilization

Answer 10

Males have Y chromosome

Females do not