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Read the 1:2:1 Incomplete-Dominance Cross
In incomplete dominance, the heterozygote has an intermediate phenotype.
NSEJS · Principles of Inheritance and Variation · 2 linked questions · 100% coverage
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Incomplete Dominance is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Study deeper: NCERT Science · Principles of Inheritance and Variation
Cross pink flowers
In Antirrhinum, red and white alleles produce pink heterozygotes. Selfing pink plants gives 1 red : 2 pink : 1 white, matching the 1:2:1 genotypic ratio.
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- ✓Red × white → pink heterozygote.
- ✓Pink self-cross → 1:2:1.
OlympIQ trap
Incomplete dominance does not produce the classic 3:1 phenotype ratio in F2.
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