Re: "We all start out as just one cell"
That's easy for you to say...
We each begin our existence as a single cell, which divides into new cells which divide into new cells. Old tissues are replaced, wounds heal, our ears – not especially useful – keep on growing even once they're quite big enough, thank you*. Cell division is pretty much the miracle of life – and yet we still don't understand …
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"Well, to be technically correct, the best kind of correct, we start off as two cells, which is the fun part. These two haploid gametes then combine to form a single-celled diploid zygote."
Is there anything that could be said to be "us" before the zygote is formed?
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Rich 11 asks: "Is there anything that could be said to be "us" before the zygote is formed?"
I'm sure, that if you were a gamete and you had the power of speech, then you would talk about "us" (gametes).
BTW, given that 'zygotes' looks like a word with a greek root, do pedants rhyme it with 'Headcoatees'?
By analogy to cryptography: "cell division causes cancer, so we ought to prohibit it".
Not quite, I'd assert that the correct analogy is "cancer cells use cell division to propagate, so any cell that uses cell division should be suspected of cancerous activities!"
It would also seem to suggest that the "cure" could be enacted by allowing the proper authorities unfettered surveillance of all cell division activities, so they can act upon any cancerous divisions and keep us all safe :)
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That warning - «The chance that we are following this correctly is roughly the same as that of a man with no arms successfully throwing a handful of jelly through a falling doughnut at thirty yards. Without touching the sides.» - should be taken ad notam, not least when Mr Page pronounces upon climate science and global warming....
Henri
Drosophila Melanogaster - the common fruit fly. It's been one of the most important tools in genetic research since the beginning of time. Glad to see it hasn't lost its usefulness! We used them back in the 1960's when I was studying statistical genetics.
Part of the massive computer experiment "Deep Thought" used back in the 10,000's BV.