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

What is the genotype of an organism?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses.

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

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 expected phenotypic ratio from a monohybrid cross of two heterozygous parents (Pp x Pp)?

Back

The expected phenotypic ratio is 3:1 (3 purple: 1 white).

Front

What is the expected genotypic ratio from a monohybrid cross of two heterozygous parents (Pp x Pp)?

Back

The expected genotypic ratio is 1:2:1 (1 PP: 2 Pp: 1 pp).

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., BB or bb).