. A woman is uncertain which of two is the father of her child. DNA typing is carried out on blood from the child (C), the mother (M), and the two males (A and B), using probes for a highly polymorphic DNA marker on two different chromosomes (“locus 1” and “locus 2”). The result is shown in the accompanying diagram. Does either or both of the tested loci rule out any of the males as being the possible father? Explain your reasoning.