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Article #5486Re: genetique [ex La notion de race d�bout�e scientifiquement]
From: Jerry M.
Date: Fri, 16 Feb 2001 21:04
Date: Fri, 16 Feb 2001 21:04
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michel gouretzky a d�cid� de nous �crire: > Jean-Paul <holocene@noos.fr> a �crit: > >> Donc quand un spermatozo�de va s'unir � un ovule, il va donner >> 1 oeuf sur 2^46 combinaisons g�n�tiques th�oriquement possibles. >> Soit 7.10^13 (70 000 milliards) >> >> Et Jerry va rappliquer en disant : oui, mais en plus du brassage >> interchromosomique, la m�iose produit un brassage intrachromosomique gr�ce >> � la possibilit� de recombinaison (crossing over) entre chromosomes >> homologues lors de la Prophase I. Donc le nombre est encore plus �lev� ! > > Ce qui ne correspond pas aux chiffres des g�n�ticiens, qui sont eux m�me > tr�s diff�rends suivant les sources, 27 000 et 1 milliard. Eh ben justement: quelles sont ces sources? JM, incr�dule
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X-Google-Language: FRENCH,ASCII X-Google-Thread: fedf7,6b91e52d184c8bb X-Google-Attributes: gidfedf7,public X-Google-Thread: f55d3,9c134a50286dd369 X-Google-Attributes: gidf55d3,public X-Google-Thread: ff0b7,6b91e52d184c8bb X-Google-Attributes: gidff0b7,public X-Google-Thread: f9e17,6b91e52d184c8bb X-Google-Attributes: gidf9e17,public X-Google-ArrivalTime: 2001-02-16 04:05:29 PST Date: Fri, 16 Feb 2001 13:04:49 -0800 From: Jerrym_1995@REMOVEyahoo.fr (Jerry M.) Newsgroups: fr.sci.philo,fr.bio.general,fr.bio.genome,fr.bio.medecine Subject: Re: genetique [ex La notion de race d�bout�e scientifiquement] Message-ID: <Jerrym_1995-1602011304490001@bb51-153.unil.ch> References: <96e7om$1fn0$1@news4.isdnet.net> <96eodl$1lp$1@wanadoo.fr> <xpEi6.2600$pE3.5450890@nnrp5.proxad.net> <96f996$1ijs$1@news6.isdnet.net> <4R0j6.1097$yr.3522701@nnrp1.proxad.net> Organization: no X-Newsreader: Certainly not Microsoft NNTP-Posting-Host: bb51-153.unil.ch X-Trace: 16 Feb 2001 13:05:19 +0100, bb51-153.unil.ch Lines: 19 Path: arc1-ca.pugleaf.net!supernews.google.com!sn-xit-02!sn-xit-01!supernews.com!newsfeed.stanford.edu!paloalto-snf1.gtei.net!news.gtei.net!enews.sgi.com!news-zh.switch.ch!cisun5000.unil.ch!Jerrym_1995