Ch. 2 Quiz 1

What is wrong with this statement? "Wavy hair is dominant."

• Dominance is relative. Wavy hair is dominant to what?

• Wavy hair is not a dominant trait.

• Nothing wrong, this statement works.

If a single-gene trait is controlled by 2 codominant alleles, what phenotypic ratio is expected in the offspring of 2 heterozygotes?

• 3 : 1

• 1 : 2 : 1

• 9 : 3 : 3 : 1

• 12 : 4

In ABO blood types, all 3 alleles are common in the human population. ABO blood types would therefore be called...

• Polymorphic

• Polyallelic

• Monomorphic

• Recombinant

In Bombay Phenotype, a person who is genetically blood type AB will test as blood type O. A mutation not in the blood type genes prevents this person from having any antigens on their blood cells. This mutation is described as...

• Epistasis

• Pleiotropic

• Codominant

• Fully penetrant

The reason 2 genetically deaf people might have all hearing children is due to...

• Locus heterogeneity

• Additive phenotypes

• Redundancy

• Dominant epistasis

You cross a brown rabbit and a white rabbit and they have a LOT of babies. 93 are brown and 69 are white. How many genes are likely involved fur color?

• 2 because the ratio is 9:7 (adds to 16)

• 1 because there are only 2 phenotypes

• 3 because both numbers are divisible by 3

Pure-bred dog breeds are very inbred. This is why all the members of a breed will look recognizably similar. Most of their genes will be...

• Homozygous

• Heterozygous

• Dominant

• Recessive

The reason for "gene interactions" that lead to phenotypic ratios different from the expected 9:3:3:1 is...

• Enzymes operating in the same pathway

• Enzymes operating in parallel pathways

• Enzymes operating in different trait pathways

• Genes operating in the same pathway