Which of the following types of reproductive barriers separates two species of sea cucumbers whose sperm and eggs often bump into each other but do not cross-fertilize because of incompatible proteins on their surfaces?
A) temporal isolation
B) habitat isolation
C) mechanical isolation
D) gametic isolation

Question

Quizplus · Accepted Answer

The type of reproductive barrier described is gametic isolation, in which sperm and egg of different species do not fuse because of incompatible molecules on their surfaces. This is the case for the sea cucumbers in the scenario. Temporal isolation refers to species that breed at different times, habitat isolation refers to species that live in different environments, and mechanical isolation refers to species that cannot mate or transfer sperm successfully due to physical incompatibilities.

Which of the Following Types of Reproductive Barriers Separates Two