Question

question 19 of 19
classify the examples as prezygotic or postzygotic barriers.
prezygotic barrier
postzygotic barrier
answer bank
individuals from two different species mate, but the resulting embryo dies before birth.
one goat species prefers flat land, whereas another goat species prefers mountainous terrain.
one fly species mates in the morning, whereas another fly species mates in the afternoon.

Explanation:

Prezygotic barriers prevent fertilization. Habitat preference (flat vs mountainous land) and mating time (morning vs afternoon) stop species from meeting/mating, so they are prezygotic. Postzygotic barriers act after fertilization; embryo death post-mating is a postzygotic barrier.

Answer:

Prezygotic barrier: One goat species prefers flat land, whereas another goat species prefers mountainous terrain; One fly species mates in the morning, whereas another fly species mates in the afternoon
Postzygotic barrier: Individuals from two different species mate, but the resulting embryo dies before birth