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How can you say that in Mendel's monohybrid cross, the F2 dominants are not all same?

Posted by Anshika Sangwan 9 months, 2 weeks ago

CBSE > Class 10 > Science

2 answers

Bharathi Devi Munagala 9 months ago

First, Mendel took pure tall pea plant(TT) and pure dwarf pea plant (tt). Then he crossed pure tall with pure dwarf. In the F1 generation, all are tall plants (Tt). When these plants are self pollinated, we get the results as TT, Tt, Tt, tt. In this three are tall and one is small. So the phenotype ratio is 3:1.But if we say the genotype ratio, we must consider the following: Homogenous Tall (TT) : 1 Heterogeneous Tall (Tt) :2 Homogenous Dwarf(tt) : 1 Hence, the genotype ratio is 1:2:1.

Priyesh Kumar 9 months, 2 weeks ago

F2 Phenotypically same but genotypically they are of two type dominant &recessive.

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