Genetics: Monohybrid and Dihybrid Crosses

Front

What is a monohybrid cross?

Back

A genetic cross between individuals that differ in one trait, typically involving one pair of contrasting traits.

Front

What is a dihybrid cross?

Back

A genetic cross between individuals that differ in two traits, typically involving two pairs of contrasting traits.

Front

Define genotype.

Back

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

Front

Define phenotype.

Back

The physical expression or characteristics of a genotype.

Front

What does it mean for an allele to be dominant?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What does it mean for an allele to be recessive?

Back

An allele that only expresses its trait when two copies are present (homozygous recessive).

Front

What is the purpose of a Punnett square?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What is the genotypic ratio of a monohybrid cross between two heterozygous parents (Aa x Aa)?

Back

1 AA : 2 Aa : 1 aa.

Front

What is the phenotypic ratio of a monohybrid cross between two heterozygous parents (Aa x Aa)?

Back

3 dominant trait : 1 recessive trait.

Front

In a dihybrid cross, what is the expected phenotypic ratio for two heterozygous parents (RrYy x RrYy)?

Back

9:3:3:1.