Dihybrid Cross

Front

What is a dihybrid cross?

Back

A dihybrid cross is a genetic cross between individuals that differ in two traits, each represented by two alleles.

Front

What is the purpose of a Punnett square?

Back

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

Front

What does the term 'allele' mean?

Back

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

Front

What is the phenotypic ratio expected from a dihybrid cross?

Back

The expected phenotypic ratio from a dihybrid cross is 9:3:3:1.

Front

Define homozygous. Give an example.

Back

Homozygous refers to having two identical alleles for a particular gene, e.g., AA or aa.

Front

Define heterozygous. Give an example.

Back

Heterozygous refers to having two different alleles for a particular gene, e.g., Aa.

Front

What is the genotype for a plant with dominant traits for both characteristics in a dihybrid cross?

Back

The genotype is represented as AABB.

Front

What is the expected genotype ratio from a dihybrid cross?

Back

The expected genotype ratio from a dihybrid cross is 1:2:1:2:4:2:1:2:1.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical characteristics of an organism.

Front

What is the significance of the F1 generation in genetics?

Back

The F1 generation is the first filial generation, resulting from a cross between two parental (P) generations.