Exam 3: Sexual Orientation Flashcards
(16 cards)
gender
societal construct about what sex people identify with
biological sex
chromosomal makeup
does gender match biological sex
no
homosexual behavior is seen in…
nonhuman species - sheep being the most studied
evidence of differences in the SDN-POA of gay versus straight rams is growing. Do ewe preferring rams have larger or smaller SDN-POA
larger
LeVay examined the ____
INAH-3 nucleus of the POA
the nucleus was larger in ____ than ____ and larger in ____ men than in _____ men
men
women
heterosexual
homosexual
fetal androgen exposure markers in women
otoacoustic emissions
finger length patterns
eyeblinks
skeletal features
measures of these indicate that lesbians as a group were exposed to more ____
androgens than heterosexual females
do these fetal androgen markers indicate a difference between gay and straight men?
no
ratio of length of index finger and ring finger
what does it indicate
2:4
lesbians on average were exposed to more prenatal testosterone than straight women
one influence on the probability of homosexuality in men is the number of ______
brothers born before
- increases 3.3% with each male pregnancy
“fraternal birth order effect” is limited to ____
right handed boys
- more older brothers, the more likely they are to pursue male partner
why does this happen that more male pregnancies result in sons that like male partners?
- with every male pregnancy blood intermixes and the mother builds antibodies to the markers of the male androgens
is human sexual orientation heritable
partly
50% relates to genetic factors
gay nontwin brothers are more likely to have the same___
Xq28 region
- only in blood related brothers - not adopted
