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Show It HEREDITY PROBLEMS I OF DEEP INTEREST H In no field of study is the posses- H sion of accurate statistics more neces- H sary than In problems of heredity. H An interesting problem concerns the H question of the likeness of animals H and their offspring -with respect to Hl birth as singles, twins and triplets. H Heape, in an analysis of the English H statistics available, says that there is 1 ,reason to believe that twin lambs pro- Hj duce more twfns than single lambs H and that the influence of heredity is H brought to hear. Rietz and Roberts B have taken up the question as deter- B mined by the statistics available ' in H this country. In the classes of sheep H studied in this instance registered B Shropshire sheep they found that in H general the twin parents give a larger M -percentage of twins among offsprings than do parents born as singles. They call attention to the fact that as it requires large numbers to establish tho significance of tho difference found, and it -would not be surprising if within R Hock of fair eize one hundred one may in some cases get even a larger percentage o twins from single parent than from twin parents; but such fluctuations would not occur in the large majority of cases. What the significance of these results are for the human being, says tho Journal of the American Medical Association, tean bo determined only by a similar study of heredity ia twin births. |