natural selection and genetic drift

Question 1

what are the 4 postulates?

Answer 1

1. individuals within a population are variable
2. some of that variation is passed from parent to offspring - heritable
3. in every generation, some individuals are more successful at surviving & reproducing
4. survival and reproduction is not random, but tied to variation in individuals aka those better at surviving are naturally selected

Question 2

there must be _____ in phenotypes and genotypes in a populations

Answer 2

variation

Question 3

variation, heritability, and differences in genotypes & phenotypes must be related to?

Answer 3

reproductive success

Question 4

define phenotypic plasticity

Answer 4

ability to express different phenotypic characteristics under different environmental conditions

Question 5

genetic drift can change?

Answer 5

gene frequencies in a population

Question 6

major concern of habitat fragmentation?

Answer 6

reducing habitat availability to the point where genetic drift will reduce genetic diversity within a population

Question 7

(t/f) reduced genetic variation indicated a higher potential for a population to evolve

Answer 7

false - lower

Question 8

define speciation

Answer 8

separation of a population into 2 or more reproductively isolated populations

Question 9

species must have reproductive isolating mechanisms:

Answer 9

geographic, incompatible gametes, incompatible physically, different diet/host

Question 10

in order for species to be “true”…?

Answer 10

the two groups must have complete reproductive isolation