Simple Y-Autosomal Incompatibilities Cause Hybrid Male Sterility in Reciprocal Crosses Between Drosophila virilis and D. americana

被引:22
作者
Sweigart, Andrea L. [1 ]
机构
[1] Univ Rochester, Dept Biol, Rochester, NY 14627 USA
基金
美国国家卫生研究院;
关键词
REPRODUCTIVE ISOLATION; SEX-CHROMOSOMES; POSTZYGOTIC ISOLATION; EVOLUTIONARY HISTORY; UNISEXUAL STERILITY; GENETIC DISSECTION; X-CHROMOSOME; SIMULANS; INTROGRESSION; MAURITIANA;
D O I
10.1534/genetics.109.112896
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Postzygotic reproductive isolation evolves when hybrid incompatibilities accumulate between diverging populations. Here, I examine the genetic basis of hybrid male sterility between two species of Drosophila, Drosophila virilis and D. americana. From these analyses, I reach several conclusions. First, neither species carries any autosomal dominant hybrid male sterility alleles: reciprocal F-1 hybrid males are perfectly fertile. Second, later generation (backcross and F-2) hybrid male sterility between D. virilis and D. americana is not polygenic. In fact, I identified only three genetically independent incompatibilities that cause hybrid male sterility. Remarkably, each of these incompatibilities involves the Y chromosome. In one direction of the cross, the D. americana Y is incompatible with recessive D. virilis alleles at loci on chromosomes 2 and 5. In the other direction, the D. virilis Y chromosome causes hybrid male sterility in combination with recessive D. americana alleles at a single QTL on chromosome 5. Finally, in contrast with findings from other Drosophila species pairs, the X chromosome has only a modest effect on hybrid male sterility between D. virilis and D. americana.
引用
收藏
页码:779 / U225
页数:11
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