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HUMAN HEREDITY
There have been many misconceptions about human heredity; most naturally, for humans are impossible to control accurately, and to be of value observations have to be made over a number of generations. But the laws of heredity work in all animals and by studying short-lived ones, easily handled, much may be learned. The extreme example is the study of fruit flies. A pair of these has two or three hundred children at a time and there are forty generations in a year. Figuring with the smallest figure, you find that theoretically the prolific pair might have a posterity of over twenty billion in a month and a half. Two thoughts inevitably come to mind: what a wonderful opportunity to study inheritance, and how fortunate that there are so many lethal agents in the world.
It is granted that the laws of heredity do hold for man, which is what we want to know, for what cares the average person as to the scientist’s experiments with guinea pigs, flies, or plants? We cannot keep family records as we do with fruit flies for, although Joseph Smith’s family may have lived in Vermont for a century or so, his posterity lived in Utah and the early Mormons practiced polygamy, complicating statistics. The royal families of Europe, however, practically lived in showcases, and their famous disease, hemophilia, in which some of the men were “bleeders,” could be shown to be hereditary, although tracing this was tricky. As only the men have the trouble and only the women transmit it, a couple of generations without sons could put the matter beyond the ken of many families.
I had no uncle or great-uncle on my mother’s side, so there might well have been a bleeder in my family about the time of the Revolution without my knowing it. The fact that I am not a bleeder proves nothing, for only a small proportion of possible inheritors get into trouble. In fact, I have just seen in a good book on heredity the pedigree of a bleeder family, and out of twenty-two men in three generations only three were bleeders. Perhaps this will convince you that heredity is a mighty intricate subject.
*78/276/5*



