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(D) cross between a heterozygous dominant individual $(Aa)$ and a homozygous recessive individual $(aa)$ is known as a test cross.In this cross,the ga

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$1:1$

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(D) cross between a heterozygous dominant individual $(Aa)$ and a homozygous recessive individual $(aa)$ is known as a test cross.In this cross,the gametes produced by the heterozygous parent are $A$ and $a$,while the homozygous recessive parent produces only $a$ gametes.The resulting offspring genotypes are $Aa$ and $aa$ in a $1:1$ ratio.Therefore,the phenotypic and genotypic ratio of the progeny is $1:1$.

When a heterozygous dominant is crossed with a homozygous recessive,the ratio of the progeny will be:

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