Exam 3: Sexual Orientation Flashcards
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
