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Politics : PRESIDENT GEORGE W. BUSH -- Ignore unavailable to you. Want to Upgrade?

To: goldworldnet who wrote (285928)	8/12/2002 11:05:58 AM
From: TigerPaw	Read Replies (2) \| Respond to of 769667

An artificial chromosome has been put into the animals to carry human immune system genes. news.bbc.co.uk This development gives insite into how new species arise under Natural Selection. Most likely a chromosome breaks in two, a reasonably common mutation, giving the animal and it's offspring an extra chromosome, like these cows. An animal with a broken chromosome can still mate with the previous generation. When it is time for the chromosomes to join in the egg both fragments line up with the corresponding whole chomosome of the partner. A percentage, usually 25%, of the offspring will have the "extra" chomosome. The next step to really get a species that can no longer reproduce with the prior generations is isolation. If a group of mostly "extra" chromosome animals becomes reproductively isolated for many generation there is a good chance that their dna will obtain enough mutations that they can no longer reproduce with the former population, but have a stable population of with a different chromosome count. It is likely that these transgenic cows will be further modified to become a new species. This will prevent the genetic modifications from escaping into the cow population as a whole which could cause trade problems with Europe. TP