The above study was of long ago and studied one of the first genes known about (around 1900) as it was reflected in fertility (defined as numbers of children produced). Finding was that ABO B was the most fertile of males and ABO B was the least fertile of females. they don't speculate as to why this could be true. In some studies I have read, it would appear that types ABO B are more likely to have A- trait either expressed or not. So perhaps A- trait helps males be fertile but hurts females. One could speculate that the opposite would be true, and that males need to be aggressive and females more passive when it comes to mating. However, there is a long tradition of a belief that "the female chasing the male until he catches her". At any rate, there was sexual dimorphism.
In the NPA genes, does it appear that there is sexual dimorphism in fertility or in any other issue?
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