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Principles of Inheritance and Variation
Monohybrid Cross
1 question from 1 paper, each with its answer.
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Concepts tested
- Only heterozygous gene segregates
All Questions
2002 AIPMT 1 question
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A plant of $F_1$-generation with genotype \"AABbCC\"". On selfing of this plant what is the phenotypic ratio in $F_2$-generation : -"In the genotype AABbCC, only the gene pair B/b is heterozygous; AA and CC are homozygous.
On selfing, AA $\times$ AA gives all AA and CC $\times$ CC gives all CC, so these genes do not produce any variation in phenotype.
Bb $\times$ Bb gives BB : Bb : bb = 1 : 2 : 1, i.e. 3 dominant : 1 recessive in phenotype.
So the cross behaves like a monohybrid cross, and the phenotypic ratio in $F_2$ is 3 : 1.