Dobzhansky T, Ayala F J
Proc Natl Acad Sci U S A. 1973 Mar;70(3):680-3. doi: 10.1073/pnas.70.3.680.
A comparative study of chromosomal and enzyme polymorphisms in Drosophila pseudoobscura and in D. persimilis was conducted from April 1971 to October 1972 by taking samples at monthly intervals in two different localities. Seasonal cyclic changes occur in the chromosomal polymorphisms. Significant changes occur in the frequencies of the enzyme polymorphisms; preliminary evidence indicates that some of these changes may also be cyclic. Natural selection is the main process responsible for the changes in both kinds of polymorphisms.
1971年4月至1972年10月期间,通过在两个不同地点每月采集样本,对拟暗果蝇和佩氏果蝇的染色体和酶多态性进行了比较研究。染色体多态性存在季节性循环变化。酶多态性的频率发生了显著变化;初步证据表明,其中一些变化也可能是周期性的。自然选择是导致这两种多态性变化的主要过程。