Punnett Square Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotypes of offspring from 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, such as 'TT' or 'tt'.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as 'Tt'.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is the genotype of a homozygous recessive organism?

Back

The genotype of a homozygous recessive organism is represented as 'tt'.

Front

If tallness (T) is dominant to shortness (t), what is the phenotype of a 'Tt' plant?

Back

The phenotype of a 'Tt' plant is tall.

Front

What is the expected genotype ratio from a cross between 'Tt' and 'tt'?

Back

The expected genotype ratio is 50% Tt and 50% tt.

Front

What is the expected phenotype ratio from a cross between 'Tt' and 'tt'?

Back

The expected phenotype ratio is 50% tall and 50% short.

Front

What is the probability of obtaining a homozygous dominant offspring from a 'Tt' x 'Tt' cross?

Back

The probability is 25%.

Front

What does it mean if a trait is dominant?

Back

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