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 allele combinations from the parents.

Front

What does it mean if an organism is homozygous?

Back

An organism is homozygous when it has two identical alleles for a particular trait.

Front

What does it mean if an organism is heterozygous?

Back

An organism is heterozygous when it has two different alleles for a particular trait.

Front

What is a dominant trait?

Back

A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

Front

What is a recessive trait?

Back

A recessive trait is one that is only expressed in the phenotype when two copies of the allele are present.

Front

How do you determine the phenotype from a genotype?

Back

The phenotype is determined by the expression of the alleles in the genotype, where dominant alleles mask recessive ones.

Front

What is the purpose of using a Punnett Square?

Back

The purpose of using a Punnett Square is to calculate the probability of an offspring inheriting particular traits from its parents.

Front

What does the term 'allele' refer to?

Back

An allele is a variant form of a gene that can produce different traits.

Front

If a plant has the genotype 'TT', what is its phenotype?

Back

The phenotype is dominant, as 'T' is a dominant allele.

Front

If a plant has the genotype 'tt', what is its phenotype?

Back

The phenotype is recessive, as 't' is a recessive allele.