Experimental studies on the duration of life. VII. The Mendelian inheritance of duration of life in crosses of wild type and quintuple stocks of Drosophila melanogaster. VIII. The influence upon duration of life of certain mutant genes of Drosophila melanogaster
Pearl, R.; Parker, S.L.; Gonzalez, B.M.
American Naturalist, 57: 153-191, 289-325
In this study, involving the determination of the duration of life of 5,415 individual flies, a cross was made between a long-lived stock of Drosophila (Old Falmouth, wild type) and a short-lived stock (Quintuple). In the F1 generations the progeny were somewhat longer lived than either parent stock. In F2 there was a definite and clear-cut segregation in respect of duration of life, long-lived and short-lived groups reappearing, with virtually identical mean duration of life to those of the original parent stocks. In its genetic behavior duration of life was found to be completely and invariably associated with certain morphological characteristics of the organism, in the sense that no vestigial-winged fly has ever been found, in the entire experience of the laboratory, to be long-lived, and no group of normal-winged flies has ever been found to have a life curve even approaching in form that which is characteristic of vestigial-winged flies. The probable meaning of these results, in relation to genetic phenomena in general, is discussed.