Question
Give an account of incomplete dominance with a suitable example.
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Answer
Incomplete dominance:
- Incomplete dominance is a deviation of Mendel’s law of dominance.
- In incomplete dominance, both the alleles (genes) of an allelomorphic pair express themselves partially.
- One allele (gene) cannot suppress the expression of the other allele (gene) completely.
- In such case, there is an intermediate expression in the F1 hybrid.
- In Mirabilis jalapa, if a red-flowered (RR) plant is crossed with a white-flowered (RR) plant, then F1 offsprings have pink (Rr) flowers.
F2 Generation: Selfing of F1
Result:
Genotypic ratio - 1RR : 2Rr : 1rr
Phenotypic ratio - 1Red : 2 Pink :1 White
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