Hybrids produced from matings between closely related species can be less fit than pure breeds because
A) they compete with pure breeds for nourishment.
B) their nuclear DNA may be incompatible with the maternal DNA.
C) they are able to mate.
D) their gametes are similar in structure to those of the parents.
E) they are physically larger.

Question

Hybrids produced from matings between closely related species can be less fit than pure breeds because  
A) they compete with pure breeds for nourishment.
B) their nuclear DNA may be incompatible with the maternal DNA.
C) they are able to mate.
D) their gametes are similar in structure to those of the parents.
E) they are physically larger.

Quizplus · Accepted Answer

When closely related species mate, their nuclear DNA may not be compatible, resulting in reduced fitness or even infertility in hybrid offspring. This is known as hybrid incompatibility. The other options do not explain why hybrids are less fit than pure breeds.

Hybrids Produced from Matings Between Closely Related Species Can Be