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

How many alleles does a child inherit from each parent for each trait?

Back

1 allele from each parent.

Front

How many alleles does each person carry for a trait?

Back

2 alleles for each trait.

Front

What does the genotype 'GG' represent?

Back

Homozygous dominant genotype for a trait.

Front

What does the genotype 'gg' represent?

Back

Homozygous recessive genotype for a trait.

Front

What does the genotype 'Gg' represent?

Back

Heterozygous genotype for a trait.

Front

If 'G' represents green and 'g' represents yellow, what is the genotype for a yellow plant?

Back

gg.

Front

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

Back

75% green, 25% yellow.

Front

What is the expected phenotype ratio from a cross between a heterozygous parent and a homozygous dominant parent (Gg x GG)?

Back

100% green.

Front

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

Back

1 GG : 2 Gg : 1 gg.