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Title: how do I make a dihybrid cross? Post by: oaklandowns on Aug 7, 2012 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.
Title: how do I make a dihybrid cross? Post by: mike13m on Aug 7, 2012 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. Title: how do I make a dihybrid cross? Post by: tokem97 on Aug 7, 2012 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... |