Cromosome number changes through evolution

From: news user (news_at_sisyphus.news.be.easynet.net)
Date: 08/25/04 

Date: Wed, 25 Aug 2004 15:25:38 +0000 (UTC)

Hi,

I have a question about how through evolution the number of chromosomes
can change. When the number of chromosomes changes by accident, how is
this transmitted to the next generation and so creating a new species ?

Man has 23 chromosome pairs (46 chromosomes) and a chimpansee has 24 pairs
(48 chromosomes). Gametogensis and the fusion of sperm and oocyte is a
delicate process for which the distribution of equal pairs of chromosomes
is important. A change in the number of chromosomes in one individual will
isolate it from sexual transmission of its genes to the next generation as
far as I can see ?

Regards,

Peter

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