Dihybrid Crosses and Incomplete Dominance

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

An organism’s genetic makeup, or allele combinations

• Recessive
• Genotype
• Phenotype
• Heterozygous

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

• BBEE x bbee

• BBEe x BbEe

• BbEE x BbEe

• BBee x BBEE

Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?

• 9
• 2
• 3
• 6

AA and Aa always show up as

• dominant

• recessive

What is another way of saying "purebred"?

• homozygous
• dominant
• recessive
• heterozygous

What is considered to be the phenotype?

• Double stranded chromosomes

• The physical trait that is expressed

• The combination of genes

• All of the genetic information

When one allele is neither dominant nor recessive over another, resulting in a blended phenotype for heterozygous offspring is considered....

• Incomplete Dominance

• Codominance