Punnet 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 genotype refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What does phenotype refer to?

Back

Phenotype refers to the observable characteristics or traits of an organism, which result from the interaction of its genotype with the environment.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., TT or tt), while heterozygous means having two different alleles for a trait (e.g., Tt).

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present in the genotype.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present in the genotype.

Front

If tall (T) is dominant to short (t), what is the phenotype of a TT plant?

Back

The phenotype of a TT plant is tall.

Front

If a plant has the genotype Tt, what are its possible phenotypes?

Back

The possible phenotypes for a Tt plant are tall, since T is dominant.

Front

What are the possible genotypes from a cross between two heterozygous tall plants (Tt x Tt)?

Back

The possible genotypes are TT, Tt, and tt, with ratios of 1:2:1.

Front

What is the expected phenotypic ratio from a cross between two heterozygous tall plants (Tt x Tt)?

Back

The expected phenotypic ratio is 3 tall : 1 short.