From: DVWA gene polymorphisms and osteoarthritis
Haplotype
Frequency
Allele
A1B1
x 11
A 1
p 1 = x 11 + x 12
A1B2
x 12
A 2
p 2 = x 21 + x 22
A2B1
x 21
B 1
q 1 = x 11 + x 21
A2B2
x 22
B 2
q 2 = x 12 + x 22