Normal human variation - Normal human variation Human...

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Normal human variation Human genetics is concerned with the causes and alleviation of disease. However, an important part of the subject is the study of normal human variation, if only to disprove that there is any such thing as a "true Aryan" genetic type. (That name incidentally only means the descendent of a person who spoke the original Aryan language). There are many traits which are the products of variation in the forms of a single gene present in different individuals. Some examples include: "uncombable hair " - wild tangly hair with a triangular cross section and a longitudinal groove "wooly hair" - hair which forms tight curls ear lobes - attached or unattached ability to bend the first joint of the thumb back at a right angle ability to curl the tongue into a U section teeth present at birth - King Louis XIV of France was born in this way, much to the distress of his wet nurses colour blindness - there are several forms but the most common, affecting about one male in twelve, is deuteranopia , the inability to distinguish between red and green. It is caused by a missing gene which codes for one of the visual
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Normal human variation - Normal human variation Human...

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