If two pea plants with red flowers,whose geno | vedclass

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(C) In pea plants,red flower color $(R)$ is dominant over white flower color $(r)$.Since the offspring show a phenotypic ratio of $3:1$ ($75\%$ red an

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Both heterozygous

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(C) In pea plants,red flower color $(R)$ is dominant over white flower color $(r)$.Since the offspring show a phenotypic ratio of $3:1$ ($75\%$ red and $25\%$ white),this indicates a typical monohybrid cross between two heterozygous parents $(Rr 	imes Rr)$.According to Mendel's law of segregation,the cross $Rr 	imes Rr$ results in genotypes $RR$ $(25\%)$,$Rr$ $(50\%)$,and $rr$ $(25\%)$.Thus,the phenotypic ratio is $75\%$ red ($RR$ and $Rr$) and $25\%$ white $(rr)$.Therefore,both parent plants must be heterozygous $(Rr)$.

If two pea plants with red flowers,whose genotypes are unknown,are crossed,$75\%$ of the offspring have red flowers and $25\%$ have white flowers. The genotypes of the red-flowered parent plants must be:

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