A genetic locus that is analyzed in many forensic and paternity testing laboratories is the human leukocyte antigen known as HLA-DQ alpha. There are four major alleles at this locus known as 1, 2, 3, and 4. How many different genotypes are possible for these four alleles?

A. 8

B. 10

The possible genotypes are (1,1), (1,2), (1,3), (1,4), (2,2), (2,3), (2,4), (3,3), (3,4), and (4,4).

C. 12

D. 16

E. 24

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