Myths of human genetics
Ever wondered if those genetic traits discussed in schools as being examples of simple Mendelian inheritance - meaning one gene with two alleles and either dominant or recessive inheritance - were actually true?
John H. McDonald of the University of Delaware maintains a set of webpages called Myths of Human Genetics where he provides the evidence ... and it's not pretty. Or at least it's as complex as most biology (and genetics) actually is. The vast majority of examples taught in schools, from the ability to roll your tongue to eye color, are actually not inherited in Mendelian fashion. In fact, perhaps the only example of a commonly discussed trait that fits the bill for a trait inherited in a simple fashion is earwax.