Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents based on their genotypes.

Front

What does phenotype mean?

Back

Phenotype refers to the observable physical characteristics of an organism, such as hair color or eye color.

Front

What is genotype?

Back

Genotype is the genetic makeup of an organism, represented by letters (e.g., AA, Aa, aa).

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., AA or aa), while heterozygous means having two different alleles (e.g., Aa).

Front

What does homozygous recessive mean?

Back

Homozygous recessive refers to having two recessive alleles for a trait (e.g., aa).

Front

What is the probability of offspring inheriting a dominant trait?

Back

The probability of offspring inheriting a dominant trait depends on the genotypes of the parents.

Front

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

Back

The probability of heterozygous offspring is 50%.

Front

What is a purebred organism?

Back

A purebred organism has two identical alleles for a specific trait, such as PP or aa.

Front

What is the significance of a dominant allele?

Back

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

Front

What is the significance of a recessive allele?

Back

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