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(B) dihybrid test cross involves crossing a dihybrid $F_1$ individual (e.g.,$RrYy$) with a homozygous recessive parent (e.g.,$rryy$).In this cross,the

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$1:1:1:1$

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(B) dihybrid test cross involves crossing a dihybrid $F_1$ individual (e.g.,$RrYy$) with a homozygous recessive parent (e.g.,$rryy$).In this cross,the $F_1$ individual produces four types of gametes: $RY$,$Ry$,$rY$,and $ry$.The homozygous recessive parent produces only one type of gamete: $ry$.When these are crossed,the resulting offspring genotypes are $RrYy$,$Rryy$,$rrYy$,and $rryy$ in a ratio of $1:1:1:1$.Since each genotype corresponds to a distinct phenotype,the phenotypic ratio is also $1:1:1:1$.

The phenotypic ratio of a dihybrid test cross performed by Mendel is ....

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