Dihybrid Basics

Front

What is a dihybrid cross?

Back

A genetic cross that examines the inheritance of two different traits.

Front

How many traits are being studied in a dihybrid cross?

Back

2

Front

What does homozygous mean?

Back

An individual with two identical alleles for a trait.

Front

What does heterozygous mean?

Back

An individual with two different alleles for a trait.

Front

What is the genotype for an individual that is homozygous recessive for the first gene and heterozygous for the second gene?

Back

aaBb

Front

In a dihybrid cross, what is the expected phenotypic ratio of the offspring?

Back

9:3:3:1

Front

What gametes can be produced by an individual with the genotype AaBb?

Back

AB, Ab, aB, ab

Front

What is the definition of dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is the definition of recessive allele?

Back

An allele that only expresses its trait when two copies are present.

Front

If black fur (B) is dominant to white fur (b), what is the phenotype of a guinea pig with genotype Bb?

Back

Black fur.