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 'genotype' mean?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What is 'phenotype'?

Back

Phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

Define '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

Define '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 'incomplete dominance'?

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a phenotype that is a blend of the two.

Front

What is 'codominance'?

Back

Codominance is a genetic situation in which both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that shows both traits.

Front

What does a Punnett Square show?

Back

A Punnett Square shows the possible genetic combinations of offspring from two parents based on their genotypes.

Front

If a black chicken (BB) is crossed with a white chicken (bb), what will the offspring be?

Back

All offspring will be black (Bb) if black is dominant.

Front

What is the expected phenotype ratio in a monohybrid cross?

Back

The expected phenotype ratio in a monohybrid cross is typically 3:1 for dominant to recessive traits.