THE EVOLUTION OF SEX AND RECOMBINATION IN A VARYING ENVIRONMENT
THE EVOLUTION OF SEX AND RECOMBINATION IN A VARYING ENVIRONMENT
复制标题
DOI：
10.1093/oxfordjournals.jhered.a111355
复制
发表时间：
1993-09-01
影响因子：
3.1
通讯作者：
CHARLESWORTH, B
中科院分区：
文献类型：
--
作者：
CHARLESWORTH, B
分析了性别和基因重组在时变环境中的进化优势的理论模型。该模型假设一个数量性状受多个加性基因控制，并服从非最优选择。假设性状的最优值要么在一个方向上稳定地移动，要么遵循自相关的线性马尔可夫过程。由于从有性生殖向无性生殖的转变，遗传变异的减少对种群平均适合度的影响进行了检验。研究表明，在光照条件下，在稳定移动的最优情况下，这种转移可能导致平均适应度的大幅降低。在随机变化的环境中，特别是在自相关性较低的情况下，条件要严格得多。研究了影响遗传重组率的稀有修饰子的传播条件，并确定了对这种修饰子的选择强度。再一次，对于增加重组的进化，稳定移动的最优情况比随机最优情况更有利。
Theoretical models of the evolutionary advantages of sex and genetic recombination in a temporally varying environment are analyzed. The models assume a quantitative trait controlled by many additive genes and subject to nor-optimal selection. The optimal value of the trait is assumed either to move steadily in one direction or to follow an autocorrelated linear Markov process. The consequences for population mean fitness of a reduction in genetic variance, due to a shift from sexual to asexual reproduction, are examined. It is shown that a large reduction in mean fitness can result from such a shift in the case of a steadily moving optimum, under light conditions. The conditions are much more stringent with a randomly varying environment, especially if the autocorrelation is low. The conditions for spread of a rare modifier affecting the rate of genetic recombination are also examined, and the strength of selection on such a modifier is determined. Again, the case of a steadily moving optimum is more favorable than a random optimum for the evolution of increased recombination.