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Newsgroups: talk.origins
From: Ron O <rokim...@cox.net>
Date: Thu, 5 Nov 2009 04:56:52 -0800 (PST)
Local: Thurs, Nov 5 2009 1:56 pm
Subject: Re: Educationnal examples of homology
On Nov 5, 2:30 am, Alain Bertrand <monprenom...@free.fr> wrote:
> Hi all, Gills, jaw, ear is the most dramatic example that you can give. I > For educationnal (high school) purposes , I am looking for "good" > Up to now, I was using at both level the limbs, by showing pictures of > Thanks for your help. > Alain don't know why the students aren't interested in it. Limbs are easier to understand. If you think the jaw is boring don't use the example of the tail from fish to the fused bones of the humans to ichthyosaurs, whales, dinos, birds etc. There are the tissue layers of the embryo, as one of the most basic. You could go through why birds do not have teeth. They have the genes to produce teeth, but the two tissue layers that need to come into contact to form teeth are separated in bird development. When you put the two tissues together by graft you can get teeth formed. Those are homologous embryonic tissues. They just don't interact in the same way in birds that they do in mammals and reptiles. You can probably look up chickens with teeth on the web. Ron Okimoto You must Sign in before you can post messages.
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