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 it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even if only one copy of the allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that is only expressed in the phenotype if two copies of the allele are present.

Front

What is the genotype of a homozygous dominant individual?

Back

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

Front

What is the genotype of a homozygous recessive individual?

Back

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

Front

What is the genotype of a heterozygous individual?

Back

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

Front

If two heterozygous plants (Aa) are crossed, what is the expected phenotypic ratio?

Back

The expected phenotypic ratio is 3:1, with 75% showing the dominant trait and 25% showing the recessive trait.

Front

What is the phenotypic ratio of a cross between a homozygous dominant (AA) and a homozygous recessive (aa) individual?

Back

The phenotypic ratio is 100% dominant.

Front

In a cross between a green pea plant (GG) and a heterozygous green pea plant (Gg), what is the expected genotype ratio?

Back

The expected genotype ratio is 1 GG : 1 Gg.

Front

What is the significance of the F1 generation in genetics?

Back

The F1 generation is the first filial generation, which results from a cross between two parental (P) generations.