The sperm of one species of sea urchin is chemically incompatible with the eggs of a closely related species. This type of reproductive isolating barrier is called
A) postzygotic isolation.
B) gametic isolation.
C) low hybrid zygote viability.
D) temporal isolation.
E) behavioral isolation

Question

Quizplus · Accepted Answer

Gametic isolation refers to the fact that the gametes (sperm and egg) of different species are not compatible, preventing fertilization and ultimately reproduction between the two species. This is exactly the case described in the question, where the sperm of one species of sea urchin is chemically incompatible with the eggs of a closely related species. The other options (postzygotic isolation, low hybrid zygote viability, temporal isolation, behavioral isolation) do not fit the specific scenario described in the question.

The Sperm of One Species of Sea Urchin Is Chemically