Deckert-Cruz Denise J, Tyler Robert H, Landmesser Jacob E, Rose Michael R
Department of Ecology and Evolutionary Biology, University of California, Irvine, California, 92697-2525.
Evolution. 1997 Jun;51(3):865-872. doi: 10.1111/j.1558-5646.1997.tb03668.x.
Drosophila melanogaster populations that exhibit constrasting life histories as a result of laboratory selection were compared at several potentially relevant enzyme loci. Selection regimes included postponed reproduction, accelerated development, and intermediate generation time. Each selection regime was represented by fivefold replicated populations maintained for between 50 and 500 generations. For each population, allele frequencies were calculated from frequencies of electrophoretically distinguishable allozymes of alcohol dehydrogenase, α-glycerol-3-phosphate dehydrogenase, phosphoglucomutase, and CuZn-superoxide dismutase. Based on allozyme frequency changes consistent across replicate populations, two of the studied loci responded to both selection for postponed reproduction and selection for accelerated development. The responses to contrasting selection regimes were in opposing directions, suggesting antagonistic pleiotropy.
对因实验室选择而呈现出不同生活史的黑腹果蝇种群，在几个可能相关的酶基因座上进行了比较。选择方案包括延迟繁殖、加速发育和中等世代时间。每个选择方案由维持50至500代的五倍重复种群代表。对于每个种群，等位基因频率是根据乙醇脱氢酶、α-甘油-3-磷酸脱氢酶、磷酸葡萄糖变位酶和铜锌超氧化物歧化酶的电泳可区分同工酶的频率计算得出的。基于重复种群中一致的同工酶频率变化，所研究的两个基因座对延迟繁殖选择和加速发育选择均有响应。对不同选择方案的响应方向相反，表明存在拮抗多效性。
