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Show 0 Key to Heredity Found 11 by the Busy Scieil' Scientists working to solve 'r mysteries of heredity have (iei given a key to many of their lems with the discovery of a chromosome In the salivary m, of the yeast fly, says rntlil,j( Magazine. Some 70 times n'e size, this over-sized model of (d neuclel brings Into identic clearness the genes held tlit.ij, It Is the genes In which the ijj, tists have the greatest I nl: fo; since they are the units contn ,iB heredity. Arranged In long sl.1(f on each chromosome, a complet. Is contained In each cell and fore the giant chromosome ;,,e large-scale model of all Its bd','( brothers. In the case of the ., fly It Is thought that between f, and 3,000 genes are contain!.', 't, each cell, and since the ord ,J chromosome Is only 15-one lm,:., thousandths of an Inch long :.s( easy to see the minuteness of !? gene. There Is now proof o ' . existence of 300 genes and a f ;'J these have been individually I' fled. Each one has Its Indb . function such as controlling'' color of the eyes in the human i':, formation of the black speck J'D the wing of the fly, etc. 31 |