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 it mean for an allele to be dominant?

Back

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

Front

What does it mean for an allele to be recessive?

Back

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

Front

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

Back

The phenotype is purple, as purple (P) is dominant.

Front

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

Back

The phenotype is white, as it has two recessive alleles.

Front

What is the probability of an offspring being purple if both parents are heterozygous (Pp)?

Back

The probability is 75%.

Front

What is the genotype of an offspring that has brown hair (A) if one parent is homozygous dominant (AA) and the other is homozygous recessive (aa)?

Back

The genotype of the offspring is Aa.

Front

What are the possible genotypes of offspring from a cross between two heterozygous parents (Pp x Pp)?

Back

The possible genotypes are PP, Pp, and pp.

Front

What is the phenotype ratio of offspring from a cross between a homozygous dominant (AA) and a homozygous recessive (aa) parent?

Back

The phenotype ratio is 100% dominant trait.

Front

What is the purpose of a Punnett Square?

Back

To visualize and calculate the probability of different genotypes and phenotypes in offspring.