Punnett Squares

Front

What is a phenotype?

Back

The physical appearance or observable characteristics of an organism, such as red hair.

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by alleles (e.g., Aa, TT).

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Tt).

Front

What is a dominant allele?

Back

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

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present in the genotype.

Front

What does a Punnett Square represent?

Back

A tool used to predict the probability of offspring genotypes from parental genotypes.

Front

What is the probability of an offspring having a specific genotype in a Punnett Square?

Back

Each box in a Punnett Square represents a 25% probability for each genotype.

Front

What is the difference between homozygous dominant and homozygous recessive?

Back

Homozygous dominant has two dominant alleles (e.g., TT), while homozygous recessive has two recessive alleles (e.g., tt).

Front

What does it mean if an organism is purebred?

Back

It means the organism is homozygous for a trait, having identical alleles.