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Which of the following best explains the relationship between complementary factor genes and the phenomenon of hybrid vigor?
Complementary factor genes result in increased heterozygosity, which is responsible for hybrid vigor.
Complementary factor genes result in increased homozygosity, which is responsible for hybrid vigor.
Complementary factor genes are not related to the phenomenon of hybrid vigor.
Complementary factor genes result in the production of sterile offspring, which is a characteristic of hybrid vigor.
Answers (1)
Hybrid vigor, also known as heterosis, is a phenomenon where the offspring of two different purebred varieties exhibit greater vigor and growth than either of the parent varieties. This phenomenon is often seen in agricultural crops and livestock. Complementary factor genes play a role in hybrid vigor by increasing heterozygosity. In a hybrid cross between two purebred lines, the complementary factor genes at different loci will contribute different sets of dominant and recessive alleles to the offspring. This results in greater genetic diversity and heterozygosity in the hybrid offspring, which can lead to increased growth and vigor. Hence option A is the correct answer.
Option(B) Complementary factor genes result in increased heterozygosity, not homozygosity. Hence option B is incorrect.
Option(C) complementary factor genes are related to hybrid vigor. Hence option C is incorrect.
Option(D) The production of sterile offspring is not a characteristic of hybrid vigor, but rather a characteristic of some types of hybridization. Hence option D is incorrect.
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