In pea plants,hybrids between red-flowered an | vedclass

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(A) Let the red flower allele be $R$ and the white flower allele be $r$. The hybrid between red $(RR)$ and white $(rr)$ strains is $Rr$ (red-flowered)

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Red flowers only

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(A) Let the red flower allele be $R$ and the white flower allele be $r$. The hybrid between red $(RR)$ and white $(rr)$ strains is $Rr$ (red-flowered).When this hybrid $(Rr)$ is crossed back with the pure red-flowered strain $(RR)$:$Rr 	imes RR ightarrow RR, RR, Rr, Rr$.All offspring possess at least one dominant $R$ allele,resulting in $100\%$ red-flowered progeny.Therefore,the correct option is $A$.

In pea plants,hybrids between red-flowered and white-flowered strains were crossed back to a pure red-flowered strain. The progeny of this cross will have:

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