Lecture 11 Flashcards Preview

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Flashcards in Lecture 11 Deck (10):
1

nonrandom mating

indicates that individuals of one genotype reproduce more often with each other
-we marry similar to ourselves about 80% of the time

2

traits that influence our mate choice

-physical appearance
-ethnic or religious preferences

3

conditions that change allele frequences

1) nonrandom mating
2) migration
3) genetic drift
4) mutation
5) natural selection

4

examples of nonrandom mating

consanguinity - marriage between blood relatives

endogamy - marriage within a community

5

migration

-genes move from one area to another
-the addition or removal of alleles will alter the genotypic frequencies

6

clines

gradients in allele frequencies between successive neighboring populations
-can suggest patterns of migration
-can be either abrupt or gradual

7

what is cline boundaries correlated to?

historical events
cultural differences
geographical barriers
language differences
patterns of migration

8

genetic drift

the change in allele frequencies when a small group separates from the larger whole

9

what is genetic drift cause by?

random sampling errors

10

Events that create small populations: (which enhances the effect of genetic drift)

-founding a new population
-bottlenecks (natural disaster, famine)
-geographic separation (islands)
-cultural separation