This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ality 52% of the time, dizygotic
twins 22% of the times
o Females- monozygotic 48%, dizygotic 16%
o Key point: more than half of the monozygotic twins were discordant in spite of identical
genes and similar rearing ...other factors contribute
o 1993 dean hamer -
linkage on the tip of the x chromosome
o correlation with birth order - H-
Y Genes produce antigens
o 2005 study by mustlanski- linkage on long arm of chromosome 7
Evidence that homosexuality reduces evolutionary fitness in humans
o homosexuals in SF had ⅕ the number of children as heterosexuals
o openly homosexuals had 1/10th the number of children as heterosexual conterparts
6% of males are homosexual
o possible evolutionary scenarios
o reproductive advantage for heterozygote
o altruism/ kin selection
o linkage to the x chromosome
Animals exhibit homosexual behaviors- bonobos, and laysan albatross Lecture 24 Part one: Race in America before 1900
Herodotus (Father of History)
● started looking at cultural variation
● main distinction living in a city or rural area. education or not
Biblical Scholars and Race
● three races→ europeans, oriental, african
● human variation matched with expectation of Genesis
Felt like the climate was the cause of education
● focused on france→ colder = more educated
● If it wasn’t Asia who were the people that lived there??
● Noah only had three sons→ BIG PROBLEM!!
Pope Paul II
● “indians are truly men…” →...
View Full Document