Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents based on their genotypes.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as 'TT' or 'tt'.

Front

What does heterozygous mean?

Back

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

Front

What is a dominant trait?

Back

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

Front

What is a recessive trait?

Back

A recessive trait is a genetic trait that is only expressed in the phenotype when two copies of the allele are present.

Front

What is the genotype of a plant with two dominant alleles?

Back

The genotype is homozygous dominant, represented as 'AA'.

Front

What is the genotype of a plant with one dominant and one recessive allele?

Back

The genotype is heterozygous, represented as 'Aa'.

Front

What is the genotype of a plant with two recessive alleles?

Back

The genotype is homozygous recessive, represented as 'aa'.

Front

If a purple flower (PP) is crossed with a white flower (pp), what will the offspring's genotype be?

Back

All offspring will have the genotype 'Pp', which means they will all be purple.

Front

What is the phenotypic ratio of a monohybrid cross between two heterozygous parents (Tt x Tt)?

Back

The phenotypic ratio is 3:1, with three dominant traits to one recessive trait.