In Rice, green colour of leaf can develop either in the presence of recessive allele p or another gene I. The latter gene is

Suppressor

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Epistatic

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Complementary

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Supplementary.

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Solution

The correct option is A Suppressor

In rice, the green colour of plants is governed by the gene I which is dominant over purple colour. The purple colour is controlled by a dominant gene P. When a cross was made between green (IIpp) and purple (iiPP) colour plants, the F₁ was green. Inter-mating of F1 plants produced green and purple plants in 13 : 3 ratio. Here the allele I isepistatic to alleles P and p. Hence in F2, plants with I-P-(9/16), I-pp (3/16) and iipp (1/16) genotypes will be green because I will mask the effect of P or p. Plants with iiP-(3/16) will be purple, because I is absent.
So, the correct option is ‘suppressor’.

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