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Define incomplete dominance with are example? 1+1=2 maraks

Define incomplete dominance with are example? 1+1=2 maraks

Grade:12

2 Answers

Mahima Kanawat
1010 Points
6 years ago
Dear student ...... Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed or completely dominant over its paired allele............ This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles..............Ex .....In a cross between true-breeding red-flowered (RR) and true breeding white-flowered plants (rr), the F 1 (Rr) was pink....... When the F1 was self-pollinated the F 2 resulted in the following ratio 1 (RR) Red : 2 (Rr)Pink: 1 (rr)White, the phenotype ratios had changed from the 3:1 dominant : recessive ratio because R was not completely dominant over r and this made it possible to distinguish Rr as pink from RR (red) and rr (white) . ........With regards ....mahima.(Askiitians forum expert )
Simran Vinaik
askIITians Faculty 1230 Points
6 years ago
Incomplete dominance is when one allele is not completely dominant over the other. The two alleles together encode protein thus give a blended phenotype.
In incomplete dominance the F2 generation has same phenotype and Genotype ratio- 1:2:1.
Best example is Snapdragon and Mirabilis jalapa.The F1progeny from a cross of red and white flowered Mirabilis jalapa (four o’ clock plant) bear pink flowers. This would then give rise to red, pink, and white flowered plants in 1: 2: 1 ratio in F2generation.

Similarly in Snapdragon (Antirrhinum majus) plants with broad leaves and plants with narrow leaves give rise to plants with intermediate leaves in F1generation and 1 broad, 2 intermediate, and 1 narrow leaved plants in F2generation.

554-542_Incomplete+Dominance-+Incomplete+Dominance+X+Homozygous+parent.jpg

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