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Date Posted: 13:50:02 01/09/02 Wed
Author: matti pekkarinen
Subject: Re: Hmm...
In reply to: Khamul 's message, "Re: Hmm..." on 11:56:21 01/09/02 Wed

Lajien väliset risteymät ovat steriilejä, koska ei ole yhteensopivia vastingeenejä. Siis ei synny kunnon sukusoluja. Jos olisivat fertiilejä, ei pian enää olisikaan "lähisukuisia lajeja", vaan liukuva portaaton sarja ko. lajien välisiä sekoituksia.
Fertiili risteymä syntyy siten kuin vehnästä ammoin: laji A ja B: ensi syntyy AxB, joka heti kokee polyploidia:kromosomisto kahdentuu, ja niin onkin vastingeenit (identtiset)... ja myöhemmin (1 milj. vuoden päästä?) risteytyi tämä AxB sekä C keskenään, ja taas sattui kahdentuminen...

Matti

Mutta ei tämä enää paljoa luomua kosketa... lopetetaanhan pian?

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