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3

If you with 'humans' refer to our genus Homo (which is often the case), we do have multiple species, see wikipedia for an overview. The difference to many other organism groups is just that all species except Homo sapiens are extinct. Also, taxonomic ranks below the species level - such as breed, subspecies, population and race - are very poorly definined ...


0

Humans are a species and within our species we, arguably, have races. Although the term 'race' is highly controversial and ill-defined, as pointed out by @fileunderwater in his elegant answer, I just want to express that races can be, in a way, compared to breeds and hence that the human species does have some of the species-subdivisions you are addressing. ...


7

This is an interesting question, and there are a number hypotheses available to explain this phenomenon. The short answer (as far as I can say this after my literature search) is that we don't know the answer for sure. The long version follows below. The main problem with all these hypothesis is that they have some valid point, but a definitive hasn't been ...


4

Note: This is based on literature searches I've done a while ago out of general curiosity. I'm in no way an expert on human reproduction. If I understand you correctly you are basically asking if there are any evidence for sex biases in offspring between families, that has a heritable genetic basis. This has been an active research topic for a long time ...


2

The question you're asking is essentially a version of an old riddle: If you flip a coin ten times and it comes up heads each time, what are the odds that the coin will come up heads when you flip it for an eleventh time? And of course the answer is that the odds are fifty-fifty. You could instead argue that 10 heads in a row is evidence that the coin is ...



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