Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does homozygous mean?

Back

Homozygous means having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous means having two different alleles for a particular gene, such as Aa.

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present (e.g., A in Aa).

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present (e.g., aa).

Front

How can two purple flowers produce white flower offspring?

Back

Both flowers are heterozygous and can pass on the white allele.

Front

What genotype must a plant have to be a yellow seed?

Back

The genotype must be AA or Aa.

Front

What is the probability of offspring being green if brown is dominant?

Back

The probability is 2/4.

Front

What does it mean to express a trait?

Back

To express a trait means to show that trait in the organism's appearance or phenotype.

Front

What is the phenotype of a homozygous dominant plant?

Back

The phenotype of a homozygous dominant plant is the dominant trait (e.g., purple flowers).