A plant with red flowers was crossed with another plant with yellow flowers. If F $_{1}$ showed all flowers orange in colour, explain the inheritance.

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Solution

Incomplete dominance

Incomplete dominance is a gene interaction in which both the alleles of a particular gene are partially expressed, as the dominant allele is not able to completely mask the effect of recessive allele resulting in an intermediate phenotype.

Cross between red (RR) and yellow (rr) flower plant

Cross between red (RR) and yellow (rr) flower plant is as follows:

The plant with red flowers having genotype RR is crosssed with a plant with yellow flowers having genotype rr.

They produced orange coloured flowers (Rr) in the F $_{1}$ generations as opposed to the dominant trait observed by mendel. The red color encoding allele is unable to completely mask the effect of the yellow color encoding allele resulting in formation of an orange colour.

r r

R Rr
(Orange) Rr
(Orange)

R Rr
(Orange) Rr
(Orange)

Cross between red (RR) and yellow (rr) flowered plants produces all orange (Rr) progeny in F $_{1}$ generation due incomplete dominance.

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