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Two genes 'A' and 'B' are linked. In a d...

Two genes 'A' and 'B' are linked. In a dihybrid cross involving these two genes, the `F_1` heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?

A

`1:1:1:1`

B

`9:3:3:1`

C

`3:1`

D

`1:1`

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