A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N.
Which of the following is a possible partial genotype for the son?
A) IBIBB) IBIA
C) ii
D) IBi
E) IAIA
Answer: D
Which of the following is a possible genotype for the mother? A) IAIA
B) IBIBC) ii
D) IAi
E) IAIB
Answer: D
Which of the following is a possible phenotype for the father? A) A negative
B) O negativeC) B positive
D) AB negative
E) impossible to determine
Answer: C
If both children are of blood type M, which of the following is possible?
A) Each parent is either M or MN.B) Each parent must be type M.
C) Both children are heterozygous for this gene.
D) Neither parent can have the N allele.
E) The MN blood group is recessive to the ABO blood group.
Answer: A
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