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Evolution has done such a fantastic job on so many aspects of life that it leaves us in wonderment. Even Darwin struggled to see how the eye could have evolved to its current perfection, yet there is one blatant shortfall in what evolution has done - the probability of a successful, unassisted childbirth.
"If the chances of breach birth or other complications have little to do with the mother's genotype but are in fact environmental or just bad luck, then there are no genes that can be "selected" through increased survival of progeny."
If the mother's genotype does influence the ease of birth one could be very hard-hearted and speculate that children who could survive a "difficult birth" would be the very strongest babies - therefore mothers with a predisposition to trouble in childbirth would have fewer surviving children but they would be very strong and perhaps more likely to successfully breed.
The most widely held misunderstanding is that Evolution is directed towards the constant improvement and development of species when the truth of it is that Evolution is purely concerned with random changes (mutations) of individuals within species and furthermore, it is only when such a random change in an individual confers an advantage over other individuals.
what may be an advantage in one environment might be a disadvantage in a different environment.
But surely, an inability to survive childbirth gives any genetic line a very distinct disadvantage...
But death in childbirth stops the continuance of those genes point blank.
Eyebrows are not vital to survival, yet partly due to their practical application to diverting sweat from the eyes, and partly due to our predilection to their aesthetic attractiveness, they have evolved to what we have now