Evolution, Population Dynamics

Question 1

gene flow

Answer 1

alterations to composition of gene pool due to migrations

Question 2

directional selection

Answer 2

one extreme is favored, so that population starts to express that extreme phenotype more often

Question 3

assortative mating

Answer 3

when mates are not chosen randomly, certain individuals are selected over others

Question 4

genetic drift

Answer 4

changes in a gene pool due to random chance

Question 5

analogous structure

Answer 5

a structure is evolved separately from two different lineages (wings for insects and birds)

Question 6

close evolutionary relationship

Answer 6

recent common ancestor; similar embryonic development; similar genes for ribosomes

Question 7

adaptive radiation

Answer 7

when one lineage diverts into many as isolated populations occupy different niches

Question 8

bottleneck effect

Answer 8

when a large population is drastically reduced; similar to founder effect

Question 9

pre-zygotic reproductive isolation (5 types)

Answer 9

1. temporal - mating patterns different in timing
2. place - location
3. behavioral - they don’t attract each other
4. mechanical - the parts don’t fit
5. gametic isolation - fertilization is impossible

TPBMG

Question 10

post-zygotic reproductive isolation (3 types)

Answer 10

1. zygote mortality - the zygote dies
2. hybrid inviability - the organism is born but doesn’t mature
3. hybrid sterility - hybrid won’t produce offspring