Question 10 Host specificity of Rhagoletis pomonella reduces gene flow between t

Question

Question 10

Host specificity of Rhagoletis pomonella reduces gene flow between the apple and hawthorn races by 4% to 6% in each generation. This is an example of

Select one:

a. allopatric speciation.

b. assortative mating.

c. secondary contact.

d. resource competition.

Question 11

Select one:

a. Sympatric speciation

b. Parapatric speciation

c. Allopatric speciation via dispersal across the Isthmus of Panama

d. Allopatric speciation via isolation when the Isthmus of Panama closed

Question 12

Drosophila biologists often delimit species boundaries by crossing individuals from different populations. Implicit in this method is the

Select one:

a. evolutionary species concept.

b. phenetic species concept.

c. phylogenetic species concept.

d. biological species concept.

Explanation / Answer

10. The correct answer is option (b).

b. assortative mating.

The gene flow between groups is reduced by the assortive mating and it promotes divergence. Apples and hawthors are not separated geographically. The fruit preferences results in the assortive mating in these groups. In hawthorns ripening occurs about three weeks after apples hence, the selection is either and not in between.

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