Refer to the figure. A long, narrow hybrid zone exists in Europe between the ranges of the fire-bellied toad and the yellow-bellied toad.The persistence of this zone can be attributed to which factor?
A) Hybrid fitness is high, but reinforcement strengthens the prezygotic barriers between the two species.
B) Hybrid offspring have the same fitness as non-hybrid offspring.
C) Both species travel long distances over the course of their lives.
D) Hybrid fitness is low, but individuals from outside the hybrid zone regularly move into the hybrid zone.
E) An adaptive radiation is occurring.

Question

Refer to the figure.  A long, narrow hybrid zone exists in Europe between the ranges of the fire-bellied toad and the yellow-bellied toad.The persistence of this zone can be attributed to which factor?
A) Hybrid fitness is high, but reinforcement strengthens the prezygotic barriers between the two species. 
B) Hybrid offspring have the same fitness as non-hybrid offspring. 
C) Both species travel long distances over the course of their lives. 
D) Hybrid fitness is low, but individuals from outside the hybrid zone regularly move into the hybrid zone. 
E) An adaptive radiation is occurring.

Quizplus · Accepted Answer

The Answer of Refer to the figure.  A long, narrow hybrid zone exists in Europe between the ranges of the fire-bellied toad and the yellow-bellied toad.The persistence of this zone can be attributed to which factor?
A) Hybrid fitness is high, but reinforcement strengthens the prezygotic barriers between the two species. 
B) Hybrid offspring have the same fitness as non-hybrid offspring. 
C) Both species travel long distances over the course of their lives. 
D) Hybrid fitness is low, but individuals from outside the hybrid zone regularly move into the hybrid zone. 
E) An adaptive radiation is occurring.

Refer to the Figure