Which of the following constitute post-mating barrier(s)?
A)The sperm does not penetrate the egg
B)The chromosome numbers of sperm and egg do not match after fertilization
C)The offspring are sterile
D)An egg is fertilized but development is impaired
E)All of the choices are post-mating barriers

Question

Quizplus · Accepted Answer

All of the choices listed (A-D) are examples of post-mating barriers that prevent successful reproduction between individuals or species that have mated. For example, if the sperm is unable to penetrate the egg, fertilization cannot occur. If fertilization does occur, but the chromosome numbers of the sperm and egg do not match (as in cases where there is a difference in ploidy between two species), this can also prevent viable offspring from developing. Similarly, if the offspring resulting from such mating are sterile, as in the case of a horse and a donkey producing a mule, successful reproduction is not possible. Finally, if fertilization does occur but the resulting development is impaired, a post-mating barrier also exists. Therefore, all of these examples are forms of post-mating barriers.

Which of the Following Constitute Post-Mating Barrier(s)