Dihybrid Crosses

Front

What is a dihybrid cross?

Back

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

Front

What does the term 'dominant' mean in genetics?

Back

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

Front

What does the term 'recessive' mean in genetics?

Back

A recessive allele is one that expresses its trait only when two copies are present.

Front

What is a genotype?

Back

An organism's genetic makeup or allele combinations.

Front

What is a phenotype?

Back

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

Front

In a dihybrid cross, how many traits are being studied?

Back

Two traits are crossed.

Front

What is the expected phenotypic ratio in a dihybrid cross?

Back

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

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible allele combinations.

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene.