Dihybrid Cross

Front

What is a dihybrid cross?

Back

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

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 both genetic makeup and environmental influences.

Front

What is the purpose of a Punnett square?

Back

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

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 condition).

Front

In a dihybrid cross, what is the phenotypic ratio expected in the F2 generation?

Back

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

Front

What is the significance of the F1 generation in a dihybrid cross?

Back

The F1 generation consists of offspring from the parental generation, showing the dominant traits.

Front

What is the expected genotype ratio in the F2 generation of a dihybrid cross?

Back

The expected genotype ratio is 1:2:1:2:4:2:1:2:1.

Front

What is the role of test crosses in genetics?

Back

To determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.