Punnett Squares - Complete Dominance

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotypes of offspring from a genetic cross.

Front

What does it mean for a trait to be dominant?

Back

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

Front

What does it mean for a trait to be recessive?

Back

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

Front

What are genotypes?

Back

Genotypes are the genetic makeup of an organism, represented by the alleles it possesses.

Front

What are phenotypes?

Back

Phenotypes are the observable characteristics or traits of an organism, determined by its genotype.

Front

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

Back

The phenotype is smooth peas, as R (smooth) is dominant.

Front

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

Back

The phenotype is wrinkled peas, as r (wrinkled) is recessive.

Front

What is the genotype of a plant that is heterozygous for a trait?

Back

The genotype is represented as Rr, having one dominant and one recessive allele.

Front

What is the probability of getting a homozygous dominant offspring from a cross between RR and Rr?

Back

The probability is 50%.

Front

What is the probability of getting a homozygous recessive offspring from a cross between Rr and Rr?

Back

The probability is 25%.