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Question

RR(red) is crossed with rr(white). All Rr offspring are pink. This indicates that ‘R’ gene is

A
Mutant
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B
Recessive
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C
Hybrid
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D
Incompletely dominant
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Solution

The correct option is D Incompletely dominant
The above cross is a classical case of incomplete dominance in which heterozygous offspring show an intermediate phenotype.
This can be explained in a quantitative way. To get a red color phenotype product of both the R alleles are needed. Since in the heterozygous condition both alleles show reduced expression, the gene expression is of intermediate level.

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