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You can basically assume the overall population gender ratio was 1:1, the birth ratio might have been different but that is expected. It's a self correcting ph
by lugg 7y ago
You can basically assume the overall population gender ratio was 1:1, the birth ratio might have been different but that is expected.
It's a self correcting phenomenon where the ratio self selects towards 1:1.
https://en.m.wikipedia.org/wiki/Fisher%27s_principle https://en.m.wikipedia.org/wiki/Fisher%27s_principle
- abdullahkhalids 7y agoThat is a long term phenomena - long enough that evolution by natural selection can operate. Nothing to do with less than a thousand years/a few dozen generations.
- lugg 7y agoEvolution and natural selection do work on those timescales. Take a look at rapid evolution for examples. I'm not sure how fast exactly human birth ratios swing but I would hazard a guess a few dozen generations would be enough to self select at least partially back towards the norm. How long did it take the worlds population to recover after WW1/2? I'm happy to see evidence contrary but please don't just dismiss things as if evolution is working on geological timescales it's just not.
- jlawson 7y agoThe birth ratio tends towards near 1:1 though it is not 1:1, the population gender ratio can be heavily skewed by different death rates, as can reproductive patterns. i.e. did you know that genetic analyses have revealed that ancestrally, only 40% of men managed to reproduce, while 80% of women did? Maybe more relevant to what we're actually discussing.