whats the definition for punnett square

Question

define punnett square

Answer 1

A Punnett square is just a way to diagram a genetic cross. Suppose you are crossing two heterozygous individuals Aa X Aa. The Punnett square will look like:

 

Gametes	A	a
A	AA	Aa
a	Aa	aa

This shows that 1/4 of the offspring will have the genotype AA, 1/2 will have genotype Aa, and 1/4 of the offspring will have the genotype aa.