HW and mechanisms Flashcards
if individuals with a particular allele have increased survivability and produced more offspring they increase the ____ in the next generation
frequency of that allele
selection causes the allele frequency to
change
why does the CCR5-32 allele not increase in frequency in South Africa even though it give resistance to HIV?
because the frequency is much higher than the mortality
T/F mutation is a weak evolutionary force?
true
gene flow, the movement of alleles between populations may result in a change allele frequencies, has a ____ evolutionary effect across populations
homogenizing
alleles from continent can change alleles from islands very
quickly
genetic drift and gene flow are particularly influential on _ populations
small
when populations are small, ____ ___ may produce outcome different from what is predicted by hw
chance events
when indivuals colonize a new location, they bring one a fraction of the
gene pool
the difference in allele freq due to colonization
founder effect
when bird colonized islands in a series of steps Clegg, found that allelic diversity decreased in a
stepwise fashion
Sonya Clegg examined silvery birds that are were native to Australia but had colonized
New Zealand and adjacent islands
