The ABO blood group assorts independently of the Rhesus (Rh) blood group and the
ID: 24787 • Letter: T
Question
The ABO blood group assorts independently of the Rhesus (Rh) blood group and the MN blood group. Three alleles, IA, IB, and i, occur at the ABO locus. Two alleles, R, a dominant allele producing Rh+, and r, a recessive allele for Rh-, are found at the Rh locus, and codominant alleles M and N occur at the MN locus. Each gene is autosomal.A: A child with blood types A, Rh-, and M is born to a woman who has blood types O, Rh-, and MN and a man who has blood types A, Rh+, and M. Determine the genotypes of each parent.
B: What proportion of children born to a man with genotype IAIB, Rr,MN and a woman who is IAi, Rr,N will have blood types B, Rh-, and MN? Show your work.
C: A man with blood types B, Rh+, and N says he could not be the father of a child with blood types O, Rh-, and MN. The mother of the child has blood types A, Rh+, and MN. Is the man correct? Explain.
Explanation / Answer
The ABO blood group assorts independently of the Rhesus (Rh) blood group and the MN blood group. Three alleles, IA, IB, and i, occur at the ABO locus. Two alleles, R, a dominant allele producing Rh+, and r, a recessive allele for Rh-, are found at the Rh locus, and codominant alleles M and N occur at the MN locus. Each gene is autosomal.
A: A child with blood types A, Rh-, and M is born to a woman who has blood types O, Rh-, and MN and a man who has blood types A, Rh+, and M. Determine the genotypes of each parent.
Each gene is autosomal.
A: A child with blood types A, Rh-, and M
woman who has blood types O, Rh-, and MN and
woman -------genotype----------Io Io Rh- Rh- MN
a man who has blood types A, Rh+, and M.
man -------genotype----------Io IA Rh+ Rh- MM
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