MHT CET Medical202622 April 2026Evening ShiftBiologyPrinciples of Inheritance and VariationActual
In the F₂ generation, the genotypic and phenotypic ratios are identical in ____.
Options
- AMendelian monohybrid cross
- BPleiotropy
- CCo-dominance
- DMultiple alleles
Correct answer
C. Co-dominance
Step-by-step solution
In a Mendelian monohybrid cross, the phenotypic ratio in the F₂ generation is 3:1 , whereas the genotypic ratio is 1:2:1 . In the case of co-dominance (and incomplete dominance), the heterozygous condition produces a distinct phenotype where both alleles are expressed equally. When two heterozygotes are crossed, the F₂ generation yields a genotypic ratio of 1:2:1 (homozygous dominant : heterozygous : homozygous recessive) and a phenotypic ratio of 1:2:1 . Thus, the genotypic and phenotypic ratios are identical in c