If a deleterious recessive allele is maintained at a low frequency in a population, which mating system most directly increases the chance that it appears in homozygous offspring?
Correct answer: A. Mating related animals
- A. Mating related animals
- B. Mating unrelated animals
- C. Randomly sampling sires
- D. Crossing different breeds
Explanation
Related animals are more likely to carry copies of the same ancestral allele, so mating them increases homozygosity and the expression of recessive defects. Crossing unrelated or different-breed animals generally reduces this risk.
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About Animal Breeding and Genetics
Covers genes, chromosomes, inheritance, genetic variation, mutations, heritability and quantitative traits in livestock. It also includes selection methods, breeding systems, inbreeding, crossbreeding, heterosis and evaluation of traits such as growth, milk yield, fertility and disease resistance.
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