Question

Which of the following statements does not provide an explanation for hybrid vigour?

• A. Under certain circumstances, heterozygous are superior to either possible homozygous
• B. Disease-causing, homozygous recessive phenotypes from either parent are masked in the hybrids
• C. Offspring from a hybrid cross usually process the best of two desirable parents.
• D. Inherently, hybrids have no deleterious mutations.

Answer 1

Answer: (D)

Inherently, hybrids have no deleterious mutations.

Hybrid vigour is the improved quality in a hybrid offspring. An offspring has the genetic contributions from both parents. These effects are due to Mendelian or Non-mendelian inheritance. This a form of outbreeding depression.

So, the correct option is 'Option D' .