Question

Biologists divide mechanisms of reproductive isolation into:

Select one:


a. Two main groups

b. Prezygotic types of isolation and postzygotic types of isolation

c. Sexual types of isolation and geographical types of isolation

d. Both A and B are correct

e. Both A and C are correct

Answer 1

The mechanisms of reproductive isolation are divided into prezygotic barriers, which prevent fertilization, and postzygotic barriers, which affect the viability or fertility of offspring. These mechanisms contribute to speciation by creating subspecies or new species.

Step-by-step explanation:

Biologists divide mechanisms of reproductive isolation into two main groups: prezygotic barriers and postzygotic barriers. Prezygotic barriers are mechanisms that prevent reproduction before fertilization, including temporal isolation where species reproduce at different times of the year. Postzygotic barriers occur after a zygote has formed, leading to offspring that either don't survive the embryonic stage or are sterile.

For example, two species of frogs living in the same area might not interbreed because they have different mating seasons. Speciation can result from these isolation mechanisms, and it can lead to the formation of subspecies or entirely new species over time.