ch 7: hardy weinberg (drift and flow)

Question 1

populations and genetic drift

Answer 1

smaller populations are more affected by gene flow, since the overall number of alleles is smaller

Question 2

migration

Answer 2

a round trip; individuals arriving and departing

Question 3

gene flow example (snakes)

Answer 3

snakes with banded patterns is selected for on the continent; while being solid is selected for the the solid rock islands

Question 4

genetic drift example (red bladder campion flower)

Answer 4

relatively high variation and range in allele frequency upon first “blowing over” from the mainland
variation “tightens up” over time - by chance alone, lots of alleles

Question 5

gene flow can be so impactful that it disrupts selection by…

Answer 5

homogenizing phenotypes

Question 6

random walks

Answer 6

probability ends up coasting to a certain frequency after compiling trails
- ex: flipping a coin

Question 7

the founder effect

Answer 7

a small group of individuals departs from the main population and starts a new one; their genetic makeup is different

Question 8

pingelab atoll

Answer 8

one achromotopsia individual ended up making the whole island’s population have achromotopsia

Question 9

elephant seals

Answer 9

population was reduced to ~20
smithsonia killed 8
bottlenecking caused extreme biodiversity loss until mutations could act on them