Question

For each description of reproductive isolation, select the option that best describes it.

Two species of orchids have different floral anatomy.

      [ Choose ]            gametic isolation            habitat isolation            behavioral isolation            mechanical isolation            temporal isolation      

One species of Drosophilia breed in early morning, another species of Drosophilia breed in the afternoon.

      [ Choose ]            gametic isolation            habitat isolation            behavioral isolation            mechanical isolation            temporal isolation      

Rana aurora (red-legged frog) breeds in fast-moving water. Rana catesbiana (bullfrog) breeds in ponds.

      [ Choose ]            gametic isolation            habitat isolation            behavioral isolation            mechanical isolation            temporal isolation      

Giant clams release sperm and eggs into open water, the gametes recognize one another by molecular markers on the cell surface.

      [ Choose ]            gametic isolation            habitat isolation            behavioral isolation            mechanical isolation            temporal isolation      

Answer 1

1. Mechanical isolation (as they are structurally different)

2. Temporal isolation (due to difference in their mating timings)

3. Habitat isolation   (as their habitat preferences are different causing isolation)

4. Gametic isolation (as the gametes recognizes only its own kind of markers)