Punnett Squares - Challenge yourself?

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from a cross between two parents.

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

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 for a purebred dominant trait?

Back

The genotype for a purebred dominant trait is represented as 'PP'.

Front

What is the genotype for a purebred recessive trait?

Back

The genotype for a purebred recessive trait is represented as 'pp'.

Front

What is the phenotypic ratio in a monohybrid cross?

Back

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

Front

How do you determine the probability of an offspring having a dominant trait?

Back

You can determine the probability by analyzing the Punnett Square and counting the number of dominant allele combinations.

Front

What is the purpose of a test cross?

Back

A test cross is used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.