Given the DNA fingerprints of two individuals with some bands being shared by both individuals, we define a new measure of the degree of similarity between the DNA profiles of two individuals. We use this measure to calculate the expected DNA similarity of two unrelated individuals of a randomly mating population; this similarity is due to chance only. Then, the expected similarity between two related individuals is obtained; this similarity is due to chance andrelatedness. From these results, the degree of similarity due to relatedness alone may be calculated.
Eugenics, unlike science, involves decision making on various issues, and decision making involves the risk of making errors. This communication first clarifies the nature and seriousness of making errors known as type II in the statistical literature, i.e. the error of punishing a person when he is not guilty of the crime attributed to him. Eugenic laws in China and the eugenic movements in England and the United States are briefly reviewed. The explosive advances made in medical and population genetics in the last 40 years are replacing the conventional eugenics programs by new approaches. Modern genetic counseling has been introduced as the intermediate agent between the scientist and the family that needs advice. It is stressed that individual rights must be respected under all circumstances.
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