Punnett Square Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from a cross between two parents.

Front

What does HETEROZYGOUS mean?

Back

Heterozygous refers to having two different alleles for a specific gene, one inherited from each parent.

Front

What is the probability of an offspring being HOMOZYGOUS if both parents are HETEROZYGOUS?

Back

25%.

Front

What does it mean if an offspring has a 0% chance of having a trait?

Back

It means that the trait cannot be expressed in the offspring based on the parents' genotypes.

Front

If a trait is dominant, what does that imply about its expression?

Back

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

Front

What is the chance of an offspring being HETEROZYGOUS if both parents are HETEROZYGOUS?

Back

50%.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is only expressed in the phenotype if both alleles are recessive.

Front

How do you determine the genotypes of parents in a Punnett Square?

Back

The genotypes of the parents are placed on the top and side of the Punnett Square.

Front

What is the expected phenotype ratio for a monohybrid cross between two heterozygous parents?

Back

3:1 ratio of dominant to recessive phenotypes.

Front

What is the significance of the 25% chance in a Punnett Square?

Back

It indicates the probability of an offspring inheriting a specific genotype or phenotype.