There are several genes in humans in addition to the ABO gene that give rise to
ID: 52582 • Letter: T
Question
There are several genes in humans in addition to the ABO gene that give
rise to recognizable antigens on the surface of red blood cells in humans.
The MN and Rh genes are two examples. The Rh locus can contain either a
positive or negative allele with positive being dominant to negative. M
and N are codominant alleles of the MN gene. The chart below shows several
mothers and their children. For each pair of mother and child, choose the male (Q through T) who could be the father of the child; choose from among the following males. Select Q for O M Rhneg, R for A M Rhpos, S for O MN Rhpos, T for B MN Rhpos, . If the
first is Q, the second is R, the third is S and the fourth is T, enter QRST). Assume that each male can be the father of only one of the children listed (i.e. use the male genotypes only once in your answer).
A) Mother is O M Rhpos, Child is A M Rhneg
B) Mother is AB N Rhneg, Child is B MN Rhneg
C) Mother is O M Rhpos, Child is B MN Rhneg
D) Mother is B MN Rhneg, Child is O N Rhneg
Explanation / Answer
A) Mother is O M Rhpos, Child is A M Rhneg -------> Genotype of father is A M Rhpos
B) Mother is AB N Rhneg, Child is B MN Rhneg ------> Genotype of father is O M Rhneg
C) Mother is O M Rhpos, Child is B MN Rhneg --------> Genotype of father is B MN Rhpos
D) Mother is B MN Rhneg, Child is O N Rhneg --------> Genotype of father is O MN Rhpos