Question

Make a dihybrid cross upto F2 generation.

Answer 1

Answer:

VvAa(Violet , Axial)

VA vA Va va

VA

VVAA

Viole,t Axial

VaAA

Violet, axial

VVAa

Violet ,Axial

VaAa

Violet, Axial

vA

VvAA

Violet,Axial

vvAA

White ,Axial

VvAa

Violet, Axial

vvAa

White, Axial

Va

VVAa

Violet, Axial

VvAa

Violet, Axial

VVaa

Violet, terminal

Vvaa

Violet, terminal

va

VvAa

Violet, Axial

vvAa

White, Axial

Vvaa

Violet, terminal

vvaa

white, terminal

Answer 2

Dihybrid cross involves the cross between two pairs of contrasting characters at the same time. For example, the two pairs of contrasting characters chosen by Mendel were shape and colour of seeds: round yellow seeds and green wrinkled seeds. Mendel first crossed pure bred pea plants having round yellow seeds with pure bred pea plants having wrinkled green seeds and found that only round yellow seeds were produced in the first generation. When the F1 generation pea plants having round yellow seeds were cross-bred by self-pollination then four types of seeds having different combinations of shape and colour were obtained in F2 generation. These were round- yellow, round-green, wrinkled-yellow and wrinkled-green. The phenotypic ratio of the seeds in the F2 generation was found to be 9:3:3:1.

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