Punnett Squares 2

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 'dominant trait' mean?

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 does 'recessive trait' mean?

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 for brown hair if 'A' represents brown hair and 'a' represents blond hair?

Back

The genotype for brown hair can be 'AA' or 'Aa'.

Front

If one parent has genotype 'AA' and the other has 'aa', what are the possible genotypes of the offspring?

Back

The possible genotype of the offspring is 'Aa'.

Front

What is the phenotype ratio for a cross between 'Aa' and 'Aa'?

Back

The phenotype ratio is 3:1, with 3 showing the dominant trait and 1 showing the recessive trait.

Front

What does 'homozygous' mean?

Back

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

Front

What does 'heterozygous' mean?

Back

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

Front

In a Punnett Square, what do the letters on the top and side represent?

Back

The letters on the top represent the alleles from one parent, and the letters on the side represent the alleles from the other parent.

Front

What is the purpose of using a Punnett Square?

Back

The purpose of using a Punnett Square is to visualize and calculate the probability of different genotypes and phenotypes in the offspring.