INTERRACIAL HYBRIDIZATION AND BREAKDOWN OF COADAPTED GENE COMPLEXES IN DROSOPHILA-PAULISTORUM AND DROSOPHILA-WILLISTONI
INTERRACIAL HYBRIDIZATION AND BREAKDOWN OF COADAPTED GENE COMPLEXES IN DROSOPHILA-PAULISTORUM AND DROSOPHILA-WILLISTONI
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DOI：
10.1073/pnas.44.6.622
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发表时间：
1958-01-01
影响因子：
11.1
通讯作者：
PAVLOVSKY, O
中科院分区：
文献类型：
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作者：
DOBZHANSKY, T;PAVLOVSKY, O
在热带丝虫、保利斯托鲁姆和威利斯托尼丝虫的一些当地种群或种族中，某些染色体倒位杂合个体的发生率超过 50%。在同一物种的其他群体中，相同倒位杂合子的频率低于50%。用特定地理来源的果蝇制成的实验群体通常保留了该群体的创建者所源自的当地种族的特征。染色体多态性在群体中得以维持，因为倒位杂合子的适应性优于纯合子。建立了实验群体，其创始人是具有多于或少于 50% 的某些倒转杂合子的种族之间的杂种。在这些混合地理起源的实验群体中，杂合子的频率下降到或低于具有最少倒位的亲本种族的频率水平。倒位杂合子在染色体携带的基因复合物共同适应后具有优异的适应性。在杂交群体中，这些基因复合物通过杂交而被破坏，从而导致杂种优势的丧失。
The incidence of individuals heterozygous for certain chromosomal inversions exceeds 50% in some local populations or races of D. tropicalis, P. paulistorum, and D. willistoni. In other populations of the same species the frequencies of the same inversion heterozygotes are below 50%. Experimental populations made with flies of a given geographic origin generally retain the characteristics of the local race from which the founders of the population were derived. The chromosomal polymorphism is maintained in the populations because the inversion heterozygotes are superior in fitness to the homozygotes. Experimental populations were set up, the founders of which were hybrids between races having more and fewer than 50% of heterozygotes for certain inversions. In these experimental populations of mixed geographic origins the frequencies of the heterozygotes fell to or below the frequency levels in the parental races having fewest inversions. The superior fitness of the inversion heterozygotes upon coadaptation of the gene complexes which the chromosomes carry. In hybrid populations these gene complexes are broken up by crossing ever, with a consequent loss of the heterosis.