w3 - animal reproductive systems

Question 1

Why do (most) animals have sex?

Answer 1

for fun/reward – sexual pleasure and excitement

> reproductive need, instinct

Question 2

Which form of learning is associated with sexual competence?

Answer 2

classical conditioning

Question 3

[list] Prenatal factors that may influence sexual orientation?

Answer 3

• genetic factors
• hormones
• chemicals
• immune response

Question 4

[compare] size of dimorphic nucleus in male v female rats?

Answer 4

male > female

Question 5

[compare] size of dimorphic nucleus in male v homosexual male rats?

Answer 5

male > homo male

Question 6

[compare] size of dimorphic nucleus in homosexual male v heterosexual female sheep/rams?

Answer 6

homo male = het female

Question 7

What is the human equivalent of the SDN?

Answer 7

the INAH3 (3rd interstitial nucleus of the anterior hypothalamus)

Question 8

[compare] size of INAH3 in male and female humans?

Answer 8

male > female

Question 9

[compare] size of INAH3 in homosexual male and female humans?

Answer 9

homo male = female

Question 10

[compare] size of INAH3 in heterosexual male and homosexual male humans?

Answer 10

het > homo

Question 11

[compare] 2D/4D ratio in female v male humans?

Answer 11

female > male

Question 12

[compare] 2D/4D ratio in heterosexual females v homosexual females?

Answer 12

het > homo females

Question 13

[compare] 2D/4D ratio in heterosexual v homosexual males?

Answer 13

het = homo

Question 14

Which occurs first: Sexual differentiation of genitals or sexual differentiation of brain?

Answer 14

Sexual differentiation of genitals precedes sexual differentiation of brain!

Question 15

[list] prenatal factors that may influence gender identity?

Answer 15

• hormones
• genetic factors
• neuroanatomy