Archiver > GENEALOGY-DNA > 2010-03 > 1269892912

From: (John Chandler)
Subject: Re: [DNA] Family Finder Test
Date: Mon, 29 Mar 2010 16:07:13 -0400
References: <><><><COL123-DS674F25C03B7B69636B652C8200@phx.gbl>
In-Reply-To: <COL123-DS674F25C03B7B69636B652C8200@phx.gbl>(

Dick wrote:
> Isn't this assuming a double crossover between an autosome pair?

Yes, for simplicity. The number of crossovers, as I mentioned, is
quite variable.

> I would imply from examples I've seen in genetics texts on
> constructing linkage maps that single crossovers are much more
> likely, i.e. a single chiasmata rather than multiple chiasmata.

Examples in texts are constructed to illustrate concepts, and not
to confuse the reader with unnecessary complication.

Incidentally, the word "chiasmata" is plural!

John Chandler

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