Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site ucbvax.ARPA
Path: utzoo!linus!philabs!cmcl2!seismo!lll-crg!dual!ucbvax!molbio
From: molbio@ucbvax.ARPA (Mike Cherry)
Newsgroups: net.bio
Subject: Re: Human Genetics (a query)
Message-ID: <9729@ucbvax.ARPA>
Date: Wed, 7-Aug-85 09:55:44 EDT
Article-I.D.: ucbvax.9729
Posted: Wed Aug  7 09:55:44 1985
Date-Received: Sat, 10-Aug-85 22:44:29 EDT
References: <241@weitek.UUCP> <1825@ecsvax.UUCP> <10873@rochester.UUCP>
Reply-To: mike@molbio.UUCP (Mike Cherry)
Organization: University of California at Berkeley, Dept. Molecular Biology
Lines: 19
Keywords: chromosome recombination genetics

In article <10873@rochester.UUCP> sher@rochester.UUCP (David Sher) writes:
>With regard to recombination of the Y chromosome,  I remember something
>from highschool biology.  If my memory serves, in the process of meosis
>(sp?) where sperm and egg are formed there is a stage where there are
>two sets of genetic material floating about.  At this point there are
>two identical Y chromosomes.  These two chromosomes may be able to
>recombine.  Mistakes made in this recombination can result in variance
>among Y chromosomes.  Of course this is still a weaker effect than recombining
>with a different chromosome.  But I really know little about bio anyway.

The above process occuring during meiosis, sister chromatid exchange, can cause
mutations at very low levels - as is found with all forms of recombination.

The Y chromosome doesn't have all the genes required for "maleness", only
those involved in the determiniation of sex. The others "maleness" genes
are presumably scattered amoung the other chromosomes.

Mike Cherry
ucbvax!molbio!mike