Google| Subject | Re: The British Secret Service...[was Re: Republicanism still an offence in Eng |
| From | Celaeno |
| Date | 2002-05-08 01:44 (2002-05-08 01:44) |
| Message-ID | <3cd7f279.4770741@news.world-online.no> |
| Client | |
| Newsgroups | alt.fan.tolkien |
| Follows | Michael O'Neill |
You will not evade me, Michael O'Neill <onq@indigo.ie>:
Michael O'NeillIsn't this relatively old news now? (Theory works because mitochondria are only passed down by females)
Isn't there a book out now, or a popular theory based on recent analysis of Mitochondrial DNA [sp?] which proves we are ALL [Chinese, African, Asian, American, Polynesian] descended from a common female ancestor in Africa several millions of years ago?
<geek> Newer theory is about the evolution of the Y chromosome. Human Y chromosomes only have 50 genes (X has 3000) and basically only exists to make sure there are men, and the genes for other necessary things are now only supplied by the X chromosome in the pair. Any of these few genes that code for male sexual development could in principle be on any other chromosome, and if they should move to, say, the X chromosome through mutation, the Y chromosome would more than likely be destroyed and we'd all be genetically women. The Y chromosome has had some serious mutations the past 200-300 million years, where pieces have broken off and reattached the opposite way. Because of this, the piece can't exchange genes with the X chromosome anymore (a safeguard against mutations) and just piles up the mutations instead. Other pieces have broken off and been turned around a total of four times, and the result is that only 5 percent of the Y chromosome can protect itself from mutations through gene exchange with X.
Anyway, the fun part (for those who haven't had an aneurism yet) is that the first switcharound 2-300 mill years ago corresponds to the monotremes (platypus and echidna) evolving from reptiles, the second to the evolution of marsupials, the third to the evolution of 'real' mammals, and the fourth to the evolution of primates. </geek>
Cel the sound of three hands clapping
2002-03-30-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
