Punnett Squares

A Punnett Square is a diagram used to predict the genetic makeup of offspring from a particular cross or breeding experiment.

Homozygous dominant refers to an organism that has two identical dominant alleles for a trait (e.g., AA).

Homozygous recessive refers to an organism that has two identical recessive alleles for a trait (e.g., aa).

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents.

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

The purpose of a Punnett Square is to visualize the possible genetic combinations from a cross and to calculate the probabilities of each genotype.

It indicates that there are four possible combinations of alleles from the parents.

50%.

25%.

Each box represents a possible genotype of the offspring resulting from the combination of alleles from each parent.