Skip to main content
Back

Incomplete Dominance vs. Codominance quiz #3

Control buttons has been changed to "navigation" mode.
1/10
  • How does codominance explain the inheritance of human blood types, particularly the AB blood type?
    In human blood types, codominance is seen when both IA and IB alleles are present in a heterozygous individual. Neither allele masks the other, so both A and B molecules are equally expressed on the surface of red blood cells, resulting in the AB blood type.
  • What is incomplete dominance in genetics?
    Incomplete dominance is a pattern of inheritance where heterozygous individuals display a blended phenotype that is intermediate between the two parental phenotypes.
  • What phenotype results from crossing a homozygous red flower with a homozygous white flower under incomplete dominance?
    The offspring will have a pink flower phenotype, which is a blend of the red and white parental phenotypes.
  • How does the phenotype of a heterozygote differ between incomplete dominance and codominance?
    In incomplete dominance, the heterozygote shows a blended intermediate phenotype, while in codominance, both parental phenotypes are equally and separately expressed.
  • What is codominance and how does it differ from incomplete dominance?
    Codominance is when both alleles in a heterozygote are equally expressed in patches, rather than blending together as in incomplete dominance.
  • Describe the appearance of a flower with codominant red and white alleles.
    The flower will have both red and white patches, with each color expressed equally rather than blending into a new color.
  • How many alleles are involved in determining human ABO blood types, and which are codominant?
    Three alleles (IA, IB, and i) determine ABO blood types, with IA and IB being codominant to each other.
  • What is the genotype and phenotype of a person with type AB blood?
    A person with type AB blood has the genotype IAIB, and both A and B molecules are equally expressed on the surface of their red blood cells.
  • What blood type results from having two recessive i alleles, and what is unique about the red blood cells?
    Having two recessive i alleles results in type O blood, where the red blood cells have neither A nor B surface molecules.
  • How does codominance explain the inheritance of human blood types, particularly the AB blood type?
    In human blood types, codominance is seen when both IA and IB alleles are present in a heterozygous individual. Neither allele masks the other, so both A and B molecules are equally expressed on the surface of red blood cells, resulting in the AB blood type.