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15 Cards in this Set

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  • Back
genetic drift
big impact on small generations
-the smaller the gereration is the farther the law os probablilty predict
how does genetic drift take place?
individuals that cary a particular allele may leave more descendant than other individuals just by CHANGE
over time a series of change occurences of this type can cause an allels to become more common a population
Founder's effect
situation in which allele frequencies change as a result of the migration of a small subgroup of a population
genetic drift...
can affect a small population
-if 5 animals are there and one dies, 1/5 of its genes are gone, but if there were 500 brids and one died if is not as big of a deal
Hardy Weinberg
states that allele frequencies in a popualtion wil remain constant unless one or more factors cause those frequencies to change
genetic equilibrium
the situation in which an allele frequency remains constant
-if allele frequencies do not change, the population will nto evolve
FIVE CONDITIONS require genetic equilibrium to be maintained
one: random mating
two: the population must be very large
3: no omvement into or out of population
4: no mutations
5: no natural selection
Random Mating
all memevers of the popoulation msuit have an equal opportunity to produce offspring
-ensures that each individual has equal chance of passing on alleles
large population
genetic drift has less effect
no movement in or our of the population
the popualtions gene pool must by kept together and separate from tother gene pools b/c bring new alleles
no mutations
if they do new alleles may be introduced
no natural selection
all genotypes in the population have equal probabilties of survival and reporduction
no phenotype can hae a selective advantage over another
geographic isolation
two populations are separated by geographic barriers suchs as rivers, mountains, ore bodies of water
-squirrels because they separate physically but they all have a common ancestor
temporal isolation
two or more species reproduce at different times
behavioral isolation
occurs when two populations are capable of interbreeding but have differneces in courship rituals or other types of behavior