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In cross the between AABB xx aabb, the r...

In cross the between AABB xx aabb, the ratio of genotype in `F_2` generation between AABB, AaBB, Aabb, aabb would be

A

`9:3:3:1`

B

`1:2:2:1`

C

`7:5:3:1`

D

`2:1:1:2`

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