GENETICS OF NATURAL-POPULATIONS .27. THE GENETIC CHANGES IN POPULATIONS OF DROSOPHILA-PSEUDOOBSCURA IN THE AMERICAN SOUTHWEST
GENETICS OF NATURAL-POPULATIONS .27. THE GENETIC CHANGES IN POPULATIONS OF DROSOPHILA-PSEUDOOBSCURA IN THE AMERICAN SOUTHWEST
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DOI：
10.1111/j.1558-5646.1958.tb02968.x
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发表时间：
1958-01-01
期刊：
影响因子：
3.3
通讯作者：
DOBZHANSKY, T
中科院分区：
文献类型：
--
作者：
DOBZHANSKY, T
数据表明，加州不同地区的10个地点的果蝇种群在1940-1957年间发生了相同的方向变化--PP基因排列的染色体出现和频率增加，CH基因排列的染色体减少。由于PP染色体在得克萨斯州和落基山脉东坡的人群中最普遍，重要的是要注意到，在亚利桑那州和犹他州的10个地区中，有9个地区的PP频率没有明显增加，这些地区有1940年(或1941年)和1957年采集的样本。导致加州人口基因变化的原因尚不清楚。这些变化似乎不是由人类对苍蝇栖息地的干扰引起的；无论如何，在靠近人类种群最集中的地区的变化并不比远离这些地区的地区大。
Data are presented showing that populations of Drosophila pseudoobscura of ten localities in different parts of California have changed between 1940 and 1957 in the same direction-appearance and increase of the frequencies of chromosomes with PP gene arrangement and decrease of chromosomes with CH gene arrangement. Since PP chromosomes are most prevalent in the populations of Texas and of the eastern slope of the Rocky Mountains, it is important to note that no appreciable increases in the frequencies of PP have taken place in nine of the ten localities in Arizona and Utah for which samples taken in 1940 (or 1941) and in 1957 are available. The causes which have brought about the genetic changes in the California populations are unknown. The changes seem not to be provoked by human interference with the habitats of the flies; at any rate, the changes are no greater in localities close to the regions of greatest concentration of human populations than in localities far from such regions.