Q:

How many squares are there in the trihybrid cross Punnett square?

A:

Quick Answer

Assuming each gene has two alleles, or alternate genes, there are 64 squares in a trihybrid cross Punnett square. When there is an independent assortment of genes, the number of combinations is two raised to the power of the number of genes.

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Full Answer

Two to the third power is eight, so there are eight possible combinations for each parent. The number of squares in the Punnett square is 8 x 8, which is 64. Labelling the genes as A, B and C gives the combinations: ABC, ABc, AbC, Abc, aBC, aBc, abC, and abc. This leads to a phenotypic ratio of 27.

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