Punnett Square Practice

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 refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

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

Front

What is the probability of getting a homozygous dominant offspring from a cross of two heterozygous parents?

Back

25%.

Front

What is the probability of getting a homozygous recessive offspring from a cross of two heterozygous parents?

Back

25%.

Front

What is the probability of getting a heterozygous offspring from a cross of two heterozygous parents?

Back

50%.

Front

If a trait is dominant, what does that mean?

Back

A dominant trait is one that will be expressed in the phenotype if at least one dominant allele is present.

Front

If a trait is recessive, what does that mean?

Back

A recessive trait is one that will only be expressed in the phenotype if two recessive alleles are present.

Front

What is the expected phenotypic ratio from a monohybrid cross?

Back

The expected phenotypic ratio is typically 3:1 for dominant to recessive traits.

Front

What is the expected genotypic ratio from a monohybrid cross?

Back

The expected genotypic ratio is typically 1:2:1 for homozygous dominant, heterozygous, and homozygous recessive.