Explain which type of reproductive isolating mechanism is at work in each of the following situations:...

Explain which type of reproductive isolating mechanism is at work in each of the following situations:

1) Zebroids, the hybrid offspring of matings between horses and zebras are sterile

2) Asian lions were once common and lived in open grasslands, while Asian tigers preferred forests

3) Female fireflies identify males by the pattern of light they produce. Each species has a unique pattern of flashes.

4) Male geese have a penis, while male herons do not. Male herons are unable to fertilize female geese.

5) When pollen grains from white pine trees land on the female cones of red pine trees, fertilization does not occur.

Solutions

Expert Solution

1) Zebroids, the hybrid offspring of matings between horses and zebras are sterile.

Ans: Hybrid Infertility.

Soln: hybrid is formed but the offspring is sterile and can't reproduce.

2) Asian lions were once common and lived in open grasslands, while Asian tigers preferred forests

Ans: Ecological isolation.

Soln: in this the lion and tigers were isolated from each other and they were in different environments. Hence, Individuals mate in their own preferred habitat, and therefore do not meet individuals of other or related species with different ecological preferences.

3) Female fireflies identify males by the pattern of light they produce. Each species has a unique pattern of flashes.

Ans: Behavioural isolation.

Soln: the fireflies use a mating call which is flashing light to attract a male. Hence, Potential mates meet, but choose members of their own species.

4) Male geese have a penis, while male herons do not. Male herons are unable to fertilize female geese.

Ans: Mechanical Isolation.

Soln: the two animals don’t have the right parts to reproduce. Hence, Copulation is attempted, but transfer of sperm does not take place into the female reproductive tract.

5) When pollen grains from white pine trees land on the female cones of red pine trees, fertilization does not occur.

Ans: Gametic incompatibility.

Soln: Male gamete (pollen grain) transfer takes place, but the egg is not fertilized.

gladiator answered 1 year ago

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