6 - 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 for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

In pea plants, what is the dominant allele for tallness?

Back

The dominant allele for tallness in pea plants is represented by 'T'.

Front

What is the genotype for a homozygous dominant individual?

Back

The genotype for a homozygous dominant individual is 'TT'.

Front

What is the genotype for a homozygous recessive individual?

Back

The genotype for a homozygous recessive individual is 'tt'.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype has two different alleles for a trait, such as 'Tt'.

Front

How many alleles does an individual carry for each trait?

Back

An individual carries two alleles for each trait, one inherited from each parent.

Front

What is the phenotype of a plant with genotype 'Rr'?

Back

The phenotype of a plant with genotype 'Rr' is red flower color, since 'R' is dominant.

Front

What is the purpose of a key in a genetic cross?

Back

A key in a genetic cross defines what each allele represents, helping to interpret the results.