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Originally posted by TinkerHaus
reply to post by pazcat
They watched a 3D movie about ocean life and were eaten by sharks.
Good riddance.
Originally posted by john_bmth
Slightly more plausible than blaming the Holy Spirit.
Still, the process hadn't been proved in sharks or mammals. And there seemed to be a good reason why. An egg that fertilizes itself makes two identical sets of chromosomes, including sex chromosomes. In birds, snakes, and most lizards, two identical sex chromosomes make a male. That allows parthenogenesis to function as a DNA survival mechanism, since an isolated female—close your ears, kids—can produce a son and mate with him. But in sharks or mammals, this wouldn't work, since two identical sex chromosomes—XX—make a female.
Or so we thought. Three weeks ago, Biology Letters delivered the second surprise: "Virgin birth in a hammerhead shark." A perfectly formed baby shark had appeared in a tank in Nebraska. Tests proved she, too, was a parthenogen.
So, while it's possible for a human baby to be born of a virgin mother, it's very, very unlikely: These two genetic deletions might each have a one in 1 billion chance of occurring, and that's not counting the calcium spike and division problem required to initiate parthenogenesis in the first place.
Bonus Explainer: Are there any case reports of virgin births in the medical literature? Sort of. According to a 1995 report in the journal Nature Genetics, a mother brought her infant boy to the doctor after noticing that his head was developing abnormally. When doctors analyzed his blood, they found something truly bizarre: Despite his anatomically male features, the boy's blood cells were entirely female, consisting only of genetic material from his mother. Some of his other cells—such as those found in his urine—were normal, consisting of a combination of both maternal and paternal DNA. No one knows exactly how this occurred, but the best guess is that immediately after being fertilized, one of his mother's eggs fused with a neighboring unfertilized egg that was dividing parthogenetically. This gave rise to a boy who was considered half-parthenogenetic, since approximately half of his cells were derived from a "faux" conception, containing no remnants of his father's DNA.
Can't we rule out parthogenesis in this case, where the mother is white and the baby is black?
I suspect the more common cause of virgin birth is a related to the fact that penetration is not necessarily required for conception. In some cases, conception does involve sperm but the woman can still be a virgin with an intact hymen. The hymen is just a small opening, not a perfect seal, so the sperm can swim right through the opening, if given a chance.
That's pretty bizarre about the boy with female blood cells though, I never heard that one, thanks for posting it.
Originally posted by Aim64C
I was merely addressing the smug, ignorant comments of people claiming that natural human parthenogenesis is less plausible than ... .... I can't even come up with a clever pseudo-technical name for what this woman claims happened.
Who mentioned human parthenogenesis? Inception via a supreme deity is not parthenogenesis.
Quit getting your knickers in a twist. Who said that parthenogenesis doesn't exist? "Parthenogenesis is not inception by a supreme deity" is saying that the phenomenon of parthenogenesis does not need to be attributed to a supreme deity. We do not need to invoke a supreme deity to explain parthenogenesis, considering the former is a real phenomenon and the latter has no supporting evidence. How you've managed to interpret that as claiming to know the inner workings of a supreme deity (of whom there is no evidence for) is beyond me.
Slightly more plausible than blaming the Holy Spirit.