Phenotype and Genotype Quiz

What is a dominant allele?

• A dominant allele is a variant of a gene that is expressed or observed in an individual's phenotype, even if only one copy of the allele is present in the genotype.

• A dominant allele is a variant of a gene that is only observed in individuals with a certain phenotype.

• A dominant allele is a variant of a gene that is only present in individuals with a certain genotype.

• A dominant allele is a variant of a gene that is always expressed in an individual's phenotype.

What is a recessive allele?

• An allele that is always expressed in the phenotype of an organism.

• An allele that is only found in recessive organisms.

• An allele that is more common in dominant organisms.

• An allele that is masked or overshadowed by a dominant allele in the phenotype of an organism.

What is the difference between a dominant allele and a recessive allele?

• A dominant allele is always associated with a beneficial trait, while a recessive allele is always associated with a harmful trait.

• A dominant allele is always inherited from the mother, while a recessive allele is always inherited from the father.

• The difference between a dominant allele and a recessive allele is that a dominant allele is expressed and masks the effect of a recessive allele, while a recessive allele is only expressed when two copies are present and the dominant allele is not present.

• A dominant allele is always expressed, while a recessive allele is never expressed.

If an organism has two dominant alleles for a particular trait, what will be the phenotype?

• The phenotype will not be affected by the dominant alleles.

• The phenotype will exhibit a blend of the dominant and recessive traits.

• The phenotype will exhibit the recessive trait.

• The phenotype will exhibit the dominant trait.

If an organism has two recessive alleles for a particular trait, what will be the phenotype?

• The phenotype will exhibit the recessive trait.

• The phenotype will not be affected by the recessive alleles.

• The phenotype will exhibit a blend of the dominant and recessive traits.

• The phenotype will exhibit the dominant trait.

What is the genotype of an organism that displays a dominant phenotype?

• BB

• aa

• bb

• AA or Aa

What is the genotype of an organism that displays a recessive phenotype?

• homozygous recessive (aa)

• incomplete dominance (Aa)

• homozygous dominant (AA)

• heterozygous dominant (Aa)

Brown eyes are dominant to blue eyes. What would be the possible phenotype for a blue eyed person?

Use the letter 'Bb'

Brown eyes are dominant to blue eyes. The genotype of a person is Bb. What is their phenotype?

Hint: include the word 'eyes'

What is the phenotype of an organism with a 'bb' genotype if 'b' is a recessive allele?

• The organism will display the dominant phenotype.

• The organism will display the recessive phenotype.

• The organism will display both the dominant and recessive phenotype.

• The phenotype of the organism cannot be determined.