9th Grade Genetics Flashcard

Front

What is the genotypic ratio for a Punnet Square when brown eyes are dominant to blue eyes?

Back

1:2:1

Front

What is the phenotypic ratio for yellow peas (dominant) to green peas (recessive) in a Punnet Square?

Back

3:1

Front

What phenotype will an individual show if they are heterozygous for a trait?

Back

dominant

Front

What is the genotype for an individual with blue eyes, a recessive trait?

Back

two lowercase b's

Front

What is the physical expression of a gene called?

Back

phenotype

Front

Define genotype.

Back

The genetic makeup of an individual, represented by alleles.

Front

What are alleles?

Back

Different forms of a gene that can exist at a specific locus.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is expressed in the phenotype even if only one allele is present.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is expressed in the phenotype only when two recessive alleles are present.

Front

What is a Punnet Square used for?

Back

To predict the genotypic and phenotypic ratios of offspring from genetic crosses.