Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 12, Problem 13RQ

The ABO blood groups in humans are expressed as the IAlB, and IAalleles. The allele encodes the

A blood group antigen, lBencodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring will have AB blood type

(IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

  1. multiple alleles and incomplete dominance
  2. codominance and incomplete dominance
  3. incomplete dominance only
  4. multiple alleles and codominance

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