Evolution and humans: big brain birth canal (Evolution)

by dhw, Thursday, October 25, 2018, 11:42 (2095 days ago) @ David Turell

DAVID: Differing sizes are not surprising. Humans range from pygmy to Watusi giants at six 1/2 feet. The article correctly points out the effects of climate, and I might add altitude and small island effects among many that are known. But still the key dilemma is how it all worked as our skulls grew to accommodate the huge brain when also dealing with three different individual DNAs.
And finally what to do about dhw's intelligent cell committees in three separate folks, Mum Dad, and baby. How did they communicate and plan the changes?

They didn’t. As the skull expanded to accommodate the bigger brain, the birth canal changed to accommodate the bigger skull. And yes, whether you like it or not, each of these processes would have required cooperation between the respective cell communities. But no, it would not have been Dad’s cell communities that would have cooperated in changing Mum’s birth canal. Mum's cell communities would have had to respond to the requirements of the baby's cell communities. In your scenario, your God would have organized the cooperation.

TONY: I would also like to ask how such a minuscule population sample tells us ANYTHING. I would wager that you could find similar variation if you took 324 samples from my home county from women who gave birth this year, much less of women that gave birth around the globe and across time.

David: I agree with your quibble about sample size, but my main point is still how did the birth canal grow to accommodate the bigger skulls? Obviously not by chance.

Obviously. The body purposefully adapts to all kinds of changes. What is your theory? That your God preprogrammed every variation in every birth canal 3.8 billion years ago, or did he pop in to fiddle with each individual woman’s birth canal?

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