Unformatted text preview: to produce melanin in areas that areas with lower body temperature (extremities). A homologue of this mutation is also observed in the Himalayan mouse and in humans. 3. What causes variations in hair types? At a very basic level, we talked about how organization of keratinocytes in the hair shaft can result in some variations. But, hair types are clearly more complex and depend upon variations in specific proteins to generate multiple phenotypes. Take a look at this study published in the journal Science last year, which identified variations in three different genes that contribute to hair type in 80 different dog breeds (Cadieu, et. al. Science 326 , 150 (2009)). Below is a summary table of the three genes, one is a type of keratin:...
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