dihybrid cross diagram

The cross between two homozygous individuals differing in two characters is called dihybrid cross.

Mendel crossed true-breeding round yellow-coloured seeds (RRYY) with wrinkle green coloured seeds (rryy).

The gametes RY and ry unite on fertilisation to produce the F1 hybrid RrYy.

Mendel found that the seeds resulting from the crossing of the parents had round shaped yellow coloured seeds (RrYy) in the F1 generation.

In the next step, F1 hybrids were self-pollinated.

In the F2 generation 9 Round, yellow: 3 Wrinkled, yellow: 3 Round, green: 1 Wrinkle, green seeds are produced.

The phenotypic ratio of the dihybrid cross is 9:3:3:1.

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