If a trait exhibits considerable individual hybrid vigor but little maternal hybrid vigor, which is likely...

If a trait exhibits considerable individual hybrid vigor but little maternal hybrid vigor, which is likely to perform better: a two-breed F₁population, or the corresponding two-breed F₂population? Explain.

If a trait exhibits considerable maternal hybrid vigor but little individual hybrid vigor, which is likely to perform better: a two-breed F₁population, or the corresponding two-breed F₂population? Explain.

That is all the information given, this is a genetics question.

Expert Solution

Hybrid vigor refers to the presence of superior quality characteristics in the hybrid as compared to the parents.

The crossing of two parents gives rise to F1 progeny, which is called a hybrid.

Individual hybrid vigor arises as a result of coming together of genes from parents. On the other hand, maternal hybrid vigor arises as a result of inheritance of traits from F1 hybrid female.

Case 1:

The trait exhibits considerable individual hybrid vigor but little maternal hybrid vigor.

As the trait has considerable individual hybrid vigor, thus F1 will be directly benefited. Since the trait has little maternal vigor, thus F1 female won't be able to pass superior traits to F2.

Thus, a two-breed F1population will perform better.

Case 2:

The trait exhibits considerable maternal hybrid vigor but little individual hybrid vigor. Due to considerable maternal hybrid vigor, the progeny of F1 female will benefit more than F1 individuals. Hence, in this case, the corresponding two-breed F2 population will show better performance.

gladiator answered 1 year ago

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