What is an allele?

• A type of chromosome

• A form of a gene

• A physical trait

• A genetic mutation

Under what condition will a recessive allele for a trait be expressed?

• When a dominant allele is also present

• When two dominant alleles are present

• When no dominant allele is present

• Always, regardless of other alleles

Which term refers to the observable physical traits of an organism?

• Genotype

• Allele

• Phenotype

• Chromosome

When crossing two heterozygous guinea pigs (Hh x Hh) for hair, what is the expected phenotypic ratio of hairy to hairless offspring?

• 1:2:1

• 2:1:1

• 3:1

• 1:3