Ch. 6 Organic Evolution; Part 3

Question 1

reproductive barriers

Answer 1

biological features that prevent species from interbreeding

Question 2

what is the common question that revolves around barriers?

Answer 2

How do initially compatible populations evolve reproductive barriers?

Question 3

allopatric speciation:

Answer 3

allopatric population evolve reproductive barriers

Question 4

populations occupy separate geographic areas; cannot interbreed because they are separated but could if the geological barrier was removed

Answer 4

allopatric population

Question 5

during allopatric speciation separated populations evolve ___ and ___ to their different environments

Answer 5

-barrier
-adapt

Question 6

how does environmental change b/w allopatric populations promote genetic divergence?

Answer 6

favoring different phenotypes in separated populations

Question 7

causes of allopatric speciation

Answer 7

-vicariant speciation
-founder effect

Question 8

climate of geology causes populations to fragment

Answer 8

vicariant speciation

Question 9

sympatric speciation

Answer 9

different individuals within a species become specialized for occupying different components of the environment.
-two distinct habitats

Question 10

two species are separated by their geographic ranges but make contact along the borderline that neither species crosses.

Answer 10

parapatric speciation

Question 11

during parapatric speciation there is no ___ barrier to gene flow

Answer 11

extrinsic

Question 12

under parapatric speciation divergence may occur due to

Answer 12

reduced gene flow and different selection pressures across the population range