Genetics Review - Biology

Front

What is the genotype of a purebred organism?

Back

A purebred organism has two identical alleles for a trait (e.g., AA or aa).

Front

What is the genotype of a hybrid organism?

Back

A hybrid organism has two different alleles for a trait (e.g., Aa).

Front

What is a trait in genetics?

Back

A trait is a characteristic that is passed from parents to offspring, determined by genes.

Front

What is an allele?

Back

An allele is a variant form of a gene that can result in different traits.

Front

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

Back

The phenotypic ratio is 3:1.

Front

If a homozygous dominant plant (AA) is crossed with a homozygous recessive plant (aa), what will be the genotype of the offspring?

Back

All offspring will be heterozygous (Aa).

Front

What is the purpose of a Punnett square?

Back

A Punnett square is used to predict the genotypes and phenotypes of offspring from a genetic cross.

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

How do you calculate the percentage of offspring with a specific trait?

Back

Divide the number of offspring with the trait by the total number of offspring and multiply by 100.