The 1930 paternity test relied on the newly discovered science of serology. Science found that, in addition to ABO types, blood could be separated into other groups using the Rh, Kell, and Duffy blood group systems.
In these systems blood could also be typed as positive (dominant) or negative (recessive). However, even with serology based paternity tests, this only increased the power of exclusion to 40%.
| Father (positive/hybrid) | |||
| ALLELES (GENES) |
+ | - | |
| Mother (positive/ hybrid) | + | ++ (positive) |
+- (positive) |
| - | -+ (positive) |
-- (negative) |
|
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