Dihybrid Cross

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Both parents originally had this genotype: (Ee, Tt). The parents are known as “dihybrids” because they each have 2 hybrid genes. When dihybrids make gametes, they produce 4 possibilities which are listed on top and on the side of the box below. 

Key:

E = Two Eyes, ee = one eye

T = Triangular Head, tt = pentagonal head

 

The following phrase may also help you determine the gametes of a dihybrid:

BIG ŕ BIG

BIG ŕ small

small ŕ BIG

 small ŕ small

 

Independent assortment

Student penta-hybrids

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