Punnett Square 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, such as AA or aa.

Front

What does heterozygous mean?

Back

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

Front

What is the genotype of a plant with purple flowers if it is heterozygous?

Back

The genotype would be Pp, where P represents the dominant allele for purple flowers.

Front

What is the phenotype of a plant with the genotype BB?

Back

The phenotype would be the expression of the dominant trait, which in this case is likely to be a specific trait like purple flowers.

Front

How do you calculate the probability of an offspring having a specific genotype?

Back

The probability is calculated by counting the number of times the desired genotype appears in the Punnett Square and dividing it by the total number of possible genotypes.

Front

What is the probability of a gg offspring from a cross of Pp x Pp?

Back

The probability of a gg offspring is 2/4 or 1/2.

Front

If two heterozygous plants (Pp) are crossed, what is the probability of obtaining a homozygous recessive offspring (pp)?

Back

The probability is 1/4.

Front

What is the significance of dominant and recessive alleles in genetics?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous individuals, determining the phenotype.

Front

What is a phenotype?

Back

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