Huh?
I have a duplex renal system and so does my mother. It caused both of us problems in pregnancy so we could only have one child. My daughter did not inherit it and so it has been naturally selected out. If it had been beneficial, we'd have had more children & passed it on.
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That isn't natural selection. That's just being lucky in not passing it on. If you hadn't been able to reproduce, it would have been NS'ed out.
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That is natural selection. It made us only able to have one child who had a 50% chance of inheriting it. If we'd been able to have more children, there would be more copies of it now. Instead, it came to an end with the first child who didn't inherit it.
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Natural selection works by the number of offspring a trait enables you to have and to survive. Someone who can have 10 healthy kids has ten times the biological fitness of someone who can have one & passes on 10X as many copies of their fitter genes.
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I agree.
End of conversation
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