Lecture 11

Question 1

nonrandom mating

Answer 1

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

Question 2

traits that influence our mate choice

Answer 2

• physical appearance

- ethnic or religious preferences

Question 3

conditions that change allele frequences

Answer 3

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

Question 4

examples of nonrandom mating

Answer 4

consanguinity - marriage between blood relatives

endogamy - marriage within a community

Question 5

migration

Answer 5

• genes move from one area to another

- the addition or removal of alleles will alter the genotypic frequencies

Question 6

clines

Answer 6

gradients in allele frequencies between successive neighboring populations

• can suggest patterns of migration
• can be either abrupt or gradual

Question 7

what is cline boundaries correlated to?

Answer 7

historical events
cultural differences
geographical barriers
language differences
patterns of migration

Question 8

genetic drift

Answer 8

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

Question 9

what is genetic drift cause by?

Answer 9

random sampling errors

Question 10

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

Answer 10

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