. Biology and man. Biology; Human beings. Brothers Sister. Uncles and aunts Ernest Cousins WHAT RUNS IN FAMILIES? Ernest has blue eyes, although both his parents and his sister and his brothers have dark eyes — like his cousins and his uncles and his aunts. Some say he gets his blue eyes from his grandmother Brown, but others say he gets them from his grandfather Green. How can we tell? improve the stock by breeding from the swiftest. And the modern race horse is indeed a great improvement upon the progenitor of only a few decades back. Do-the training and racing of horses influence the perfor
. Biology and man. Biology; Human beings. Brothers Sister. Uncles and aunts Ernest Cousins WHAT RUNS IN FAMILIES? Ernest has blue eyes, although both his parents and his sister and his brothers have dark eyes — like his cousins and his uncles and his aunts. Some say he gets his blue eyes from his grandmother Brown, but others say he gets them from his grandfather Green. How can we tell? improve the stock by breeding from the swiftest. And the modern race horse is indeed a great improvement upon the progenitor of only a few decades back. Do-the training and racing of horses influence the performance of their offspring? Or does the performance reveal the possibilities of the stock? Or how is the stock improved? What people have believed about the connection between parent qualities and offspring qualities has influenced their treatment of pregnant mothers. There has been a widespread belief, for example, that if a pregnant female experienced a violent shock or a violent pleasurable emotion, the unborn child would somehow show the effects. Birthmarks, deformities, and even special talents were often ascribed to such experience. Many animal-breeders tried to influence the coloring or markings of their calves or lambs by exposing the mothers to appropriate scenery. Similarly, many human mothers today hope to ensure beautiful features for their unborn babies by gazing on the pictures of beautiful women or men. People generally think of "heredity" as a strange, mysterious force, which may or may not strike, like lightning or good luck or a pestilence. It is only in modern times that systematic research has attempted to solve the larger problems of heredity. For example, how can we measure degrees of resem- blance among individuals? Houj far can selection be carried? Can a stable, 473. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may n
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