Punnett Squares 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 (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, or aa).

Front

What is a phenotype?

Back

A phenotype is the physical appearance or observable traits of an organism, resulting from the interaction of its genotype with the environment.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 25% or 1 in 4.

Front

What is the probability of obtaining a heterozygous offspring from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 50% or 2 in 4.

Front

What is the probability of obtaining a homozygous dominant offspring from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 25% or 1 in 4.

Front

What does it mean if an organism has a dominant trait?

Back

A dominant trait is expressed in the phenotype even if only one dominant allele is present (e.g., A in Aa or AA).

Front

What does it mean if an organism has a recessive trait?

Back

A recessive trait is expressed in the phenotype only if two recessive alleles are present (e.g., aa).