黑腹果蝇自然种群中Y染色体分离的变异。
Variation in Y chromosome segregation in natural populations of Drosophila melanogaster.
作者信息
Clark A G
出版信息
Genetics. 1987 Jan;115(1):143-51. doi: 10.1093/genetics/115.1.143.
Abstract
Functional variation among Y chromosomes in natural populations of Drosophila melanogaster was assayed by a segregation study. A total of 36 Y chromosomes was extracted and ten generations of replacement backcrossing yielded stocks with Y chromosomes in two different genetic backgrounds. Eleven of the Y chromosomes were from diverse geographic origins, and the remaining 25 were from locally captured flies. Segregation of sexes in adult offspring was scored for the four possible crosses among the two backgrounds with each Y chromosome. Although the design confounds meiotic drive and effects on viability, statistical partitioning of these effects reveals significant variation among lines in Y chromosome segregation. Results are discussed in regards to models of Y-linked segregation and viability effects, which suggest that Y-linked adaptive polymorphism is unlikely.
摘要
通过一项分离研究对黑腹果蝇自然种群中Y染色体之间的功能变异进行了测定。总共提取了36条Y染色体，经过十代的回交置换，获得了Y染色体处于两种不同遗传背景下的品系。其中11条Y染色体来自不同的地理区域，其余25条来自本地捕获的果蝇。针对两种背景下每条Y染色体的四种可能杂交组合，对成年后代的性别分离情况进行了评分。尽管该设计混淆了减数分裂驱动和对生存力的影响，但对这些影响进行统计划分后发现，Y染色体分离的品系间存在显著变异。针对Y连锁分离和生存力效应模型对结果进行了讨论，这些模型表明Y连锁适应性多态性不太可能存在。
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