Punnett Squares

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 a capital letter represent in genetics?

Back

A capital letter represents a dominant allele.

Front

What does a lowercase letter represent in genetics?

Back

A lowercase letter represents a recessive allele.

Front

In a heterozygous genotype like Bb, which allele is expressed?

Back

The dominant allele is expressed.

Front

What is a homozygous dominant genotype?

Back

A homozygous dominant genotype has two identical dominant alleles, such as YY.

Front

What is a homozygous recessive genotype?

Back

A homozygous recessive genotype has two identical recessive alleles, such as yy.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype has one dominant and one recessive allele, such as Aa.

Front

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

Back

The expected phenotypic ratio is 3:1 (3 dominant: 1 recessive).

Front

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

Back

The expected genotypic ratio is 1:2:1 (1 homozygous dominant: 2 heterozygous: 1 homozygous recessive).

Front

What does it mean if an organism is homozygous?

Back

An organism is homozygous if it has two identical alleles for a trait.