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What kind of trait does this

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It is often said that certain traits "skip generations." What kind of trait does this? Can brown eyes skip generations? What about blue eyes? Why? 

Human beings can suffer from a large variety of genetic ailments. While many of these are relatively benign - or at least, mild enough that the sufferers can live with them for a lifetime - some are not. Some are always lethal. One lethal genetic disorder is Tay Sachs disease. This disease is always fatal; sufferers die before the age of five, and thus never reproduce. Tay Sachs disease is caused an autosomal recessive allele. Why doesn't a disease like Tay Sachs simply disappear from the species, since it is completely selected against (i.e., no sufferer ever has children)?

Reference no: EM132174857

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