Question

1. Give  5 SIMILAR SPECIES WITH DIFFERENT CHARACTERISTICS.

2.Give 3 examples on the REPRODUCTIVE ISOLATING MECHANISMS.

GEOGRAPHIC ISOLATION

TEMPORAL OR SEASONAL ISOLATION

BEHAVIORAL ISOLATION

MECHANICAL ISOLATION

GAMETIC ISOLATION

Answer 1

1. The examples of divergent evolution (similar species that gained different traits) include the species from the genus Equus: Equus ferus (wild horse), Equus zebra (mountain zebra), Equus kiang (kiang), Equus africanus (african wild ass, donkey), Equus hemions (asiatic wild ass).

2. Reproductive isolating mechanisms:

• GEOGRAPHIC ISOLATION: chimpanzees and bonobos separated by the river Congo.
• TEMPORAL OR SEASONAL ISOLATION: Chinook salmon who spawn at different times of the

year along.

• BEHAVIORAL ISOLATION: Some species of crickets mate only with males that produce a particular mating song.
• MECHANICAL ISOLATION: flowering plants that do not have the appropriate shape for a pollinator will not be fertilized.
• GAMETIC ISOLATION: though the sea urchins Strongylocentrotus purpuratus and S. franciscanus release their eggs and sperm simultaneously, the fertilization occurs between sperm and egg cells of the same species.