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(B) test cross is performed between an individual with a dominant phenotype (genotype unknown,$Aa$ or $AA$) and a homozygous recessive individual $(aa

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Dominant phenotype of parent was heterozygous

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(B) test cross is performed between an individual with a dominant phenotype (genotype unknown,$Aa$ or $AA$) and a homozygous recessive individual $(aa)$. If the parent with the dominant phenotype is heterozygous $(Aa)$,the cross $Aa 	imes aa$ results in a $1: 1$ ratio of dominant to recessive offspring $(Aa: aa)$. If the parent were homozygous dominant $(AA)$,the cross $AA 	imes aa$ would result in $100\%$ dominant offspring $(Aa)$. Therefore,a $1: 1$ ratio confirms that the parent with the dominant phenotype was heterozygous.

$A$ $1: 1$ phenotypic ratio in a test cross indicates that the

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