Until recently, the parents of one defective child had only two courses to follow if they wanted another baby. One was to trust to luck, worry throughout the pregnancy, and blame themselves if a defective child was born. The other was to have no child. Now, by using charts of probabilities worked out by Dr. J. A. Fraser Roberts of London's famed Guy's Hospital, a geneticist can give parents an accurate appraisal of what their chances are of producing a second defective.
Though genetics is an arcanely intricate science, the risks of unfavorable inheritance fall sharply and neatly into two...
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