Monohybrids and the Punnett Square Guinea Pigs

Which statement accurately describes a recessive allele?

• It is always represented by a capital letter.

• It will always express its trait, regardless of other alleles.

• It only expresses its trait if no dominant allele is present.

• It is a form of a gene that is never passed down to offspring.

What is the primary difference between an organism's genotype and phenotype?

• Genotype refers to the physical traits, while phenotype refers to the genetic makeup.

• Genotype refers to the genetic makeup, while phenotype refers to the physical traits.

• Genotype is always dominant, and phenotype is always recessive.

• Genotype is determined by environmental factors, while phenotype is inherited.

An organism with two different alleles for a specific trait (e.g., Hh) is described as:

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• Purebred

If two guinea pigs, both heterozygous for hair (Hh), are crossed, what is the expected phenotypic ratio of hairy to hairless offspring?

• 1:2:1

• 3:1

• 1:1

• 4:0