If two cattle are both known carriers of an autosomal recessive lethal allele, what proportion of their offspring is expected to be affected?
Correct answer: A. 25 percent
- A. 25 percent
- B. 50 percent
- C. 75 percent
- D. 100 percent
Explanation
A carrier by carrier mating has expected genotypes of 25 percent affected homozygotes, 50 percent carriers, and 25 percent normal homozygotes. The affected offspring inherit one recessive allele from each parent.
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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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