Question

The Northern hard clam and the Southern quahog are two clam species that are normally isolated by environmental tolerances. However, hybridization tends to occur when these species are cultivated in hatcheries as they are kept under the same temperature ranges and sharing enclosures. Which of the following is true?

Group of answer choices

A. Reproductive isolation between these species of clams is complete.

B. Reproductive isolation between these species of clams is incomplete.

C. Environmental conditions in their natural habitat limit the opportunities for hybridization.

D. A and C

E. B and C

Answer 1

As we can note that environmental conditions are playing major role in their hybridization.When these two species are in natural environment where the environmental conditions are behaving different for their mating process while in hatchery where the environmental conditions are controlled and are suitable for both of them , then hybridization takes place.

It suggests that Environmental conditions in their natural habitat limit the opportunities for hybridization and reproductive isolation between these two species of clams is incomplete.

So the option E is correct.