genetics and punnett squares

Front

What is a Punnett Square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does phenotype mean?

Back

The physical appearance or observable traits of an organism.

Front

What does genotype mean?

Back

The genetic makeup of an organism, represented by the alleles it possesses.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait, while heterozygous means having two different alleles for a trait.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents?

Back

3:1 ratio of dominant to recessive phenotypes.

Front

What is a recessive trait?

Back

A trait that is only expressed when two recessive alleles are present.

Front

What is a dominant trait?

Back

A trait that is expressed when at least one dominant allele is present.

Front

What is the purpose of a test cross?

Back

To determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive organism.

Front

What does it mean if an organism is purebred?

Back

It means the organism is homozygous for a specific trait, having identical alleles.

Front

What is the law of segregation?

Back

The principle that during the formation of gametes, the two alleles for a trait separate from each other.