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Gene Duplication

Reading:

Nathans, J. 1989. The genes for color vision. American Scientis t.  February 1989.

See also for review:

Zhang, J. 2003. Evolution by gene duplication: an update.  Trends in Ecol and Evol. 18:292-298.

Exercise:

Have the students test themselves for colorblindness. There are several websites with color-blindness tests available.
http://www.toledo-bend.com/colorblind/Ishihara.html

You can also find a copy of Ishihara's Tests for Colour Blindness in most university libraries.

Have students calculate frequency of colorblindness in the class - what % of men and what % of women are red/green colorblind?

Do your class results conform to published rates?