how do I make a dihybrid cross?

oaklandowns

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12 years ago

ok so i know i have too make 16 boxes. now how do i label them? pointy ears = PP,Pp and round ears = pp. im so confused. please help me, my project is due tomorrow.

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mike13m

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12 years ago

If you are doing a dihybrid you must have two genes for different traits.
PP, Pp, pp - ear shape: Pointy-P, Round-p
TT, Tt, tt - leg length: Tall-T, short-t

A dihybrid cross then is when both parents are heterozygous at each gene loci.
PpTt x PpTt

Each parent can donate gametes with one allele from each gene - PT, Pt, pT or pt.
The 4 possible gametes are the labels for the boxes on top and side of the punnet square with 16 boxes.

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tokem97

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12 years ago

Because it is a DIhybrid cross, it involves TWO genes, such as A and B, A dihybrid cross of those two genes would be AaBb x AaBb. The gametes of EACH would be AB, Ab, aB, and ab, so the Punnett square would be a 4x4: the 4 gametes are written across the top and down the side:
______AB______Ab______aB_____ _ab
AB__AABB_____________________ __________
Ab___________________________ ______
aB___________________________ ______
ab___________________________ ______

Now, just fill in the other 15 boxes...

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