If A₁ Represents an Allele at One Locus and B₁ $P _ { A _ { 1 } B _ { 1 } } = P _ { A _ { 1 } } * P _ { B _ { 1 } }$

If A₁ represents an allele at one locus and B₁ represents an allele at another locus, which equation represents linkage disequilibrium?

A) $P _ { A _ { 1 } B _ { 1 } } = P _ { A _ { 1 } } * P _ { B _ { 1 } }$
B) $P _ { A _ { 1 } B _ { 1 } } \neq P _ { A _ { 1 } } * P _ { B _ { 1 } }$
C) $D _ { A _ { 1 } B _ { 1 } } \neq P _ { A _ { 1 } } * P _ { B _ { 1 } }$
D) $D _ { A _ { 1 } B _ { 1 } } = P _ { A _ { 1 } B _ { 1 } } - P _ { A _ { 1 } } * P _ { B _ { 1 } }$