In a dihybrid cross between RRYY and rryy,the | vedclass

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(A) In a dihybrid cross,the $F_1$ generation obtained from crossing $RRYY$ and $rryy$ is $RrYy$.When $F_1$ individuals $(RrYy)$ are self-crossed to pr

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$4$

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(A) In a dihybrid cross,the $F_1$ generation obtained from crossing $RRYY$ and $rryy$ is $RrYy$.When $F_1$ individuals $(RrYy)$ are self-crossed to produce the $F_2$ generation,the phenotypic ratio is $9:3:3:1$.The genotypic ratio in the $F_2$ generation of a dihybrid cross is $1:2:1:2:4:2:1:2:1$.Specifically,the genotype $RrYy$ is a double heterozygote.In the Punnett square of a dihybrid cross,the frequency of the $RrYy$ genotype is $4$ out of $16$ total combinations.Therefore,the number of $RrYy$ genotypes in the $F_2$ generation is $4$.

In a dihybrid cross between $RRYY$ and $rryy$,the number of $RrYy$ $F_2$ genotypes will be

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