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Using the same logic, one could claim exactly the opposite. Men produce both X and Y sperm, but both are present in enormous quantity. It is only the mother's body that selects which spermatozoa will be able to reach the ovum. So you could say that the determining factor is the mother's body, i.e. the acidity/alkalinity and hospitality of the uterus to either male or female spermatozoa. I don't understand how one's strength of character can influence that, but it is possible that stronger willed women carry more of certain hormones, which ultimately influence the gender selection of spermatozoa. Likewise, men with strong character may produce stronger, more resistant Y swimmers, which increase their chance of reaching the goal safely. If both hypothesis are true, then both the father and mother's character may play a role in determining the gender of their offspring.
Since common Y-DNA haplogroups are more successful at producing male babies (hence the fact that these haplogroups have become more common, by natural selection), it would make sense to assume that common Y-DNA haplogroups are linked to stronger male character. The same would apply to mtDNA haplogroups and female strength of character.
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