7.4 Dihybrid Punnett Squares 2023

Front

What is a Dihybrid Cross?

Back

A genetic cross between individuals that differ in two traits, examining the inheritance patterns of both traits simultaneously.

Front

Define genotype.

Back

The genetic constitution of an individual, represented by the alleles inherited from the parents.

Front

Define phenotype.

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele only expresses its trait when two copies are present in the genotype.

Front

What is the purpose of a Punnett Square?

Back

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

Front

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

Back

By determining the ratio of the desired genotype in the Punnett Square and converting it to a percentage.

Front

What is the expected phenotype ratio for a dihybrid cross of two heterozygous parents?

Back

The expected phenotype ratio is 9:3:3:1.

Front

What is the significance of homozygous and heterozygous genotypes?

Back

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

Front

What is the expected percentage of homozygous recessive offspring from a cross of two heterozygous parents?

Back

The expected percentage is 25%.