A bull is heterozygous for a recessive autosomal coat colour allele. If he is mated with a homozygous dominant cow, the expected offspring are:
Correct answer: D. All phenotypically dominant
- A. Three quarters dominant and one quarter recessive
- B. Half recessive and half dominant
- C. All phenotypically recessive
- D. All phenotypically dominant
Explanation
The bull produces dominant and recessive gametes, while the homozygous dominant cow produces only dominant gametes. Every offspring therefore receives at least one dominant allele and shows the dominant phenotype.
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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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