The genotype ratio of incomplete dominance is:
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Incomplete dominance illustrates the blending of traits in heterozygous individuals.
- 3:1
- 1:2:1
- 1:1:2
- 9:3:3:1
The Correct Option is B
Approach Solution - 1
The genotype ratio in incomplete dominance is 1:2:1.
(A) 3:1 - Incorrect: This is phenotypic ratio in complete dominance.
(B) 1:2:1 - Correct: Shows 1 homozygous dominant : 2 heterozygous : 1 homozygous recessive (e.g., snapdragon flower color).
(C) 1:1:2 - Incorrect: Not a standard Mendelian ratio.
(D) 9:3:3:1 - Incorrect: This is dihybrid cross ratio.
The correct answer is (B) 1:2:1, where heterozygotes show intermediate phenotype.
Approach Solution -2
Incomplete dominance occurs when the heterozygous genotype exhibits a phenotype that is intermediate between the two homozygous phenotypes. For example, in snapdragons, crossing a red-flowered (RR) plant with a white-flowered (WW) plant produces offspring with pink flowers (RW).
The genotypic ratio of incomplete dominance is typically 1:2:1, where:
- 1 represents the homozygous dominant (e.g., RR),
- 2 represents the heterozygous (e.g., RW),
- 1 represents the homozygous recessive (e.g., WW).
Option (B) is correct because the ratio in incomplete dominance is 1:2:1.
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