In a cross of a homozygous dominant parent and a homozygous recessive parent, what is the ratio of offspring that will exhibit the recessive phenotype

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Mathematics

Bradley

12 March, 23:00

In a cross of a homozygous dominant parent and a homozygous recessive parent, what is the ratio of offspring that will exhibit the recessive phenotype

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Jakobe Stafford · Answer 1

Assuming complete dominance, * none * of the offspring will exhibit the recessive phenotype. If A is dominant to a, then the cross between a homozygous dominant parent (AA) and a homozygous recessive parent (aa) would produce offspring all sharing the same genotype (Aa, or all heterozygous).

Because A is assumed to be completely dominant over a, only those individuals with the aa genotype would exhibit the recessive phenotype.