Final answer:
A Punnett square is used to easily determine the expected percentage of different genotypes in the offspring of two parents by filling in the cells of the square with the correct alleles. It helps predict the possible combinations of alleles in the offspring of a cross between two parents.
Step-by-step explanation:
A Punnett square is a chart that allows you to easily determine the expected percentage of different genotypes in the offspring of two parents.
An example of a Punnett square for pea plants is shown in the Figure below. In this example, both parents are heterozygous for flower color (Bb). The gametes produced by the male parent are at the top of the chart, and the gametes produced by the female parent are along the side. The different possible combinations of alleles in their offspring are determined by filling in the cells of the Punnett square with the correct letters (alleles).
A Punnett square is a special tool used to predict the offspring from a cross, or mating between two parents. In a Punnett square, the possible offspring are represented by the letters in the boxes, with one factor coming from each parent.