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 'homozygous' mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as WW or ww.

Front

What does 'heterozygous' mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Ww.

Front

What is the genotype of a homozygous dominant individual?

Back

The genotype of a homozygous dominant individual is represented as 'AA' or 'WW'.

Front

What is the genotype of a homozygous recessive individual?

Back

The genotype of a homozygous recessive individual is represented as 'aa' or 'ww'.

Front

What is the genotype of a heterozygous individual?

Back

The genotype of a heterozygous individual is represented as 'Aa' or 'Ww'.

Front

If a heterozygous parent (Ww) is crossed with a homozygous recessive parent (ww), what are the possible genotypes of the offspring?

Back

The possible genotypes are 50% Ww (with wings) and 50% ww (no wings).

Front

What is the expected phenotype ratio from a cross between two heterozygous parents (Ww x Ww)?

Back

The expected phenotype ratio is 3:1, with 75% having wings and 25% not having wings.

Front

What is the expected phenotype of offspring from a cross between a homozygous dominant parent (YY) and a homozygous recessive parent (yy)?

Back

The expected phenotype is 100% dominant trait (YY) in the offspring.

Front

What does 'dominant' mean in genetics?

Back

Dominant refers to an allele that expresses its trait even when only one copy is present.