MULTIPLE INTERACTING LOCI CONTROL SEX DETERMINATION IN LAKE MALAWI CICHLID FISH

被引:148
作者
Ser, Jennifer R. [1 ]
Roberts, Reade B. [1 ]
Kocher, Thomas D. [1 ]
机构
[1] Univ Maryland, Dept Biol, College Pk, MD 20742 USA
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
Sex determination; sexually antagonistic selection; speciation; SPECIATION; EVOLUTION; MEDAKA; SELECTION; VICTORIA; ORIGIN; CHROMOSOMES; REVERSAL; MALES; DIFFERENTIATION;
D O I
10.1111/j.1558-5646.2009.00871.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Several models have been proposed to suggest how the evolution of sex-determining mechanisms might contribute to speciation. Here, we describe the inheritance of sex in 19 fish species from the rapidly evolving flock of cichlids in Lake Malawi, Africa. We found that many of these species have a male heterogametic (XY) system on linkage group 7. Some species also segregate for a female heterogametic (ZW) system on linkage group 5 that is coincident with a dominant orange-blotch (OB) color pattern in females. The ZW system is epistatically dominant to the XY system when both are segregating within a family. Several lines of evidence suggest that additional sex-determining loci are segregating in some species. These results are consistent with the idea that genetic conflicts play an important role in the evolution of these species flocks and suggest that evolution of sex-determining mechanisms has contributed to the radiation of cichlid fish in East Africa.
引用
收藏
页码:486 / 501
页数:16
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