Dihybrid Crosses

Front

What is a dihybrid cross?

Back

A genetic cross that involves two traits, each represented by two alleles.

Front

What does homozygous dominant mean?

Back

An organism with two identical dominant alleles for a trait (e.g., AA).

Front

What does heterozygous mean?

Back

An organism with two different alleles for a trait (e.g., Aa).

Front

What is a phenotype?

Back

The physical expression or characteristics of a trait.

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by alleles.

Front

How many boxes are needed in a Punnett square for a dihybrid cross?

Back

16 boxes are needed for a dihybrid cross.

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 ratio of phenotypes in a typical dihybrid cross?

Back

The typical ratio is 9:3:3:1.

Front

What does the term 'allele' refer to?

Back

An allele is a variant form of a gene.

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions.