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The Phenotypic Ratio of Incomplete Dominance is - Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy

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MCQ

The phenotypic ratio of incomplete dominance is _____________.

Options

  • 2 : 1

  • 1 : 2 : 1

  • 1 : 1 : 1

  • 1 : 1 : 2

  • 9 : 3 : 3 : 1

  • 1 : 1

  • 3 : 1

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Solution

1 : 2 : 1
In incomplete dominance, both alleles are expressed partially and one gene does not suppress the expression of the other gene. As a result, the two heterozygotes are similar phenotypically and genotypically; hence, the genotypic and phenotypic ratio observed in the F2 generation is 1:2:1.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
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