THE BARRIER TO GENETIC EXCHANGE BETWEEN HYBRIDIZING POPULATIONS
THE BARRIER TO GENETIC EXCHANGE BETWEEN HYBRIDIZING POPULATIONS
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DOI：
10.1038/hdy.1986.135
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发表时间：
1986-12-01
期刊：
影响因子：
3.8
通讯作者：
BENGTSSON, BO
中科院分区：
文献类型：
--
作者：
BARTON, N;BENGTSSON, BO
假设选择作用于一个或多个基因座以维持杂交群体之间的遗传差异。然后，与这些选定基因座连锁的中性标记基因座处的等位基因的流动将受到阻碍。我们定义并计算了两个不同的群落之间以及连续栖息地之间的基因流动障碍的衡量标准。在这两种情况下，我们发现为了使大部分基因组上的基因流显着减少，杂交体的适应性必须大大降低，并且参与构建屏障的基因数量必须如此之大，以至于大多数其他基因与正在选择的某些基因座紧密相连。该结论不受上位模式或标记基因座沿染色体的位置的很大影响。
Suppose that selection acts at one or more loci to maintain genetic differences between hybridising populations. Then, the flow of alleles at a neutral marker locus which is linked to these selected loci will be impeded. We define and calculate measures of the barrier to gene flow between two distinct demes, and across a continuous habitat. In both cases, we find that in order for gene flow to be significantly reduced over much of the genome, hybrids must be substantially less fit, and the number of genes involved in building the barrier must be so large that the majority of other genes become closely linked to some locus which is under selection. This conclusion is not greatly affected by the pattern of epistasis, or the position of the marker locus along the chromosome.