Dihybrid Crosses

Front

What is a dihybrid cross?

Back

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

Front

What is the expected phenotypic ratio in a dihybrid cross?

Back

9:3:3:1.

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Bb).

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., BB or bb).

Front

What is a phenotype?

Back

The physical trait that is expressed in an organism.

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by alleles.

Front

In a dihybrid cross, how many boxes are needed in a Punnett square?

Back

16 boxes are needed.

Front

What is the probability of obtaining a tall and white offspring in a dihybrid cross?

Back

3 out of 16.

Front

What is the purpose of a Punnett square?

Back

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

Front

What are alleles?

Back

Different forms of a gene that can exist at a specific locus.