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Topic: Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance· Genetics and Evolution

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F_1 generation, pink flowers were obtained. When pink flowers were selfed, the F_2 generation showed white, red and pink flowers. Choose the incorrect statement from the…

In \(\textit{Antirrhinum}\) (Snapdragon), a red flower was crossed with a white flower and in \(F_1\) generation, pink flowers were obtained. When pink flowers were selfed, the \(F_2\) generation showed white, red and pink flowers. Choose the incorrect statement from the following :

1. This experiment does not follow the Principle of Dominance.

2. Pink colour in \(F_1\) is due to incomplete dominance.

3. Ratio of \(F_2\) is \(\frac{1}{4}\) (Red) : \(\frac{2}{4}\) (Pink) : \(\frac{1}{4}\) (White)

4. Law of Segregation does not apply in this experiment.

1 answer

Best answer

Answer: 4. Law of Segregation does not apply in this experiment.

Key idea: Flower colour in snapdragon shows incomplete dominance, but segregation of alleles still holds.

Red (RR) x white (rr) gives pink (Rr), neither allele dominates, so the principle of dominance does not apply. Selfing pink gives 1 red : 2 pink : 1 white. This 1:2:1 ratio arises because the alleles segregate in gametes, so the law of segregation does apply. Statement 4 is therefore incorrect.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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