In the Frog Genus, When Certain Species Attempts to Mate

Multiple Choice

In the frog genus, when certain species attempts to mate with other species, embryo development is halted at various stages including zygotic segmentation, blastula formation, gastrulation, or in the final phases of embryo development. The stage where the developing frog arrests depends on the species involved in the cross. This is an example of

A) hybrid breakdown.
B) hybrid sterility.
C) hybrid inviability.
D) sexual isolation.