Exam 2 cont. Flashcards
F(B) vs. Time: drop, and plateau beneath halfway mark..
heterozygote advantage, and no equilibrium at the beginning; AB > AB > BB; p and q is 0.4 and 0.6 if equilibrium, p >0.4
F(B) vs. Time: S shape…
BB > BA > AA; two possible phenotypes,, possible beneficial recessive allele; directional selection
F(B) vs. Time: reverse S…
heterozygote disadvantage or directional selection; AA > AB > BB and BB > AB > AA; if heterozygote disadvantage exists Wmin is located where >0.75 and AA fitness > BB
Mean fitness =
p squared + 2pq + q squared
If two populations both start with a Freq (A) = 0.6, and the ΔF(A) is both positive and larger in the first population relative to the second, select all that may be true:
The first population may be smaller than the second population; The A allele has a greater advantage in the first population than the second population.
What is true of genetic drift?
It is always present, leads to less diversity, and can lead to fixation of deleterious alleles
What is true about the probability of the fixation by genetic drift?
The probability of fixation is the frequency of the allele
What could explain the haplotype vs. type graph?
population 1 bottleneck or founder event; greater population 2 size
What is true about human evolution?
Preserved footprints provide evidence that A. afarensis was bipedal; Skeletal morphology provides evidence that A. afarensis was bipedal
What can affect phenotype?
environment, dominance, and other genes
If two traits are genetically linked,
They are less likely to split from recombination
What is true of Hardy Weinberg equilibrium?
If a population is in HW equilibrium after one round of mating, they must be randomly mating
What is true of gene flow?
it reduces divergence between populations and can be influenced by genes
What is true about Fst?
High Fst could be caused by inbreeding or could be indicated by selection and genetic drift
What could be true about an isolated, non-mutating population? If I ask, “Are Adult 1 genotypes the product of Newborn 1 allele frequencies?” what am I most likely testing regarding selection?
Is there survival selection? If there is, there is no Hardy-Weinburg equilibrium
