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THE EVOLUTION OF UNUSUAL CHROMOSOMAL SYSTEMS IN SCIARID FLIES - INTRAGENOMIC CONFLICT AND THE SEX-RATIO
被引：37
作者：
HAIG, D
机构：
[1] Department of Plant Sciences, University of Oxford, Oxford, OX1 3RA, South Parks Road
关键词：
SEX RATIO;
INTRAGENOMIC CONFLICT;
MEIOTIC DRIVE;
B-CHROMOSOMES;
SCIARA;
D O I：
10.1046/j.1420-9101.1993.6020249.x
中图分类号：
Q14 [生态学（生物生态学）];
学科分类号：
071012 ;
0713 ;
摘要：
A model is presented for the evolution of the sciarid chromosomal system. In this model, a driving X chromosome caused female-biased sex ratios. The drive was exploited by maternal autosomes that segregated with the X at spermatogenesis. Genes in mothers converted some of their XX daughters into sons by eliminating a paternal X from the embryonic soma. L chromosomes were derived from X chromosomes and favored male-biased sex ratios. An X' chromosome arose that suppressed the effects of L chromosomes. The 1:1 sex ratio is a stalemate between the X' and X'X mothers causing all-female broods and the L chromosomes in XX mothers causing all-male broods. Any element (such as an L chromosome) that is preferentially transmitted through one sex will be selected to bias the sex ratio towards this sex.
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页码：249 / 261
页数：13
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