(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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(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 $(RR)$:$Rr \times RR \rightarrow RR, RR, Rr, Rr$.All offspring possess at least one dominant $R$ allele,resulting in $100\%$ red-flowered progeny.Therefore,the correct option is $A$.

Class 12 Biology Principles of Inheritance and Variation Inheritance of one gene

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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:

A
Red flowers only
B
White flowers only
C
Equal number of red and white flowers
D
Mostly red flowers

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Principles of Inheritance and Variation

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Inheritance of one gene

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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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In a cross,$75$ tall plants and $25$ dwarf plants are obtained. What would be the genotype of the parents?

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