GENETIC ARCHITECTURE OF ISOLATION BETWEEN TWO SPECIES OFSILENEWITH SEX CHROMOSOMES AND HALDANE'S RULE

Evolution ◽  
2013 ◽  
Vol 68 (2) ◽  
pp. 332-342 ◽  
Author(s):  
Jeffery P. Demuth ◽  
Rebecca J. Flanagan ◽  
Lynda F. Delph
2021 ◽  
Author(s):  
Janne Swaegers ◽  
Rosa Ana Sanchez-Guillen ◽  
Pallavi Chauhan ◽  
Maren Wellenreuther ◽  
Bengt Hansson

Contemporary hybrid zones act as natural laboratories for the investigation of species boundaries and allow to shed light on the little understood roles of sex chromosomes in species divergence. Sex chromosomes are considered to function as a hotspot of genetic divergence between species; indicated by less genomic introgression compared to autosomes during hybridisation. Moreover, they are thought to contribute to Haldane's rule which states that hybrids of the heterogametic sex are more likely to be inviable or sterile. To test these hypotheses, we used contemporary hybrid zones of Ischnura elegans, a damselfly species that has been expanding its range into the northern and western regions of Spain, leading to chronic hybridization with its sister species Ischnura graellsii. We analysed genome-wide SNPs in the Spanish I. elegans and I. graellsii hybrid zone and found (i) that the X chromosome shows less genomic introgression compared to autosomes and (ii) that males are underrepresented among admixed individuals as predicted by Haldane's rule. This is the first study in Odonata that suggests a role of the X chromosome in reproductive isolation. Moreover, our data adds to the few studies on species with X0 sex determination system and contradicts the hypothesis that the absence of a Y chromosome causes exceptions to Haldane's rule.


2019 ◽  
pp. 77-95
Author(s):  
Geoffrey E. Hill

Mitochondrial genes and nuclear genes are replicated and transmitted across generations as physically separated units. The extent to which these autonomous genomes are co-transmitted depends on the position of nuclear genes on autosomes versus sex chromosomes, and co-transmission has important implications for mitonuclear coevolution and conflict. Mitonuclear co-transmission, coadaptation, and coevolution are potentially very important for understanding fundamental evolutionary phenomena like Haldane’s rule. In addition, because mitochondrial genomes are transmitted strictly through maternal lines in most eukaryotes, selection on mitochondrial genes can favor female fitness over male fitness, leading to mother’s curse. The chapter assesses and draws conclusions about the relative importance of mitonuclear coadaptation and conflict in the evolution of eukaryotic lineages.


Evolution ◽  
2010 ◽  
Vol 64 (12) ◽  
pp. 3643-3648 ◽  
Author(s):  
Amanda N. Brothers ◽  
Lynda F. Delph

Nature ◽  
1985 ◽  
Vol 314 (6013) ◽  
pp. 668-669 ◽  
Author(s):  
J.S. Jones ◽  
Nick Barton

Genetics ◽  
1996 ◽  
Vol 143 (1) ◽  
pp. 603-607
Author(s):  
Ling-Wen Zeng

Evolution ◽  
2005 ◽  
Vol 59 (5) ◽  
pp. 1016-1026 ◽  
Author(s):  
Michel Slotman ◽  
Alessandra Della Torre ◽  
Jeffrey R. Powell

2013 ◽  
Vol 9 (5) ◽  
pp. 20130327 ◽  
Author(s):  
Matthew Schrader ◽  
Rebecca C. Fuller ◽  
Joseph Travis

Crosses between populations or species often display an asymmetry in the fitness of reciprocal F 1 hybrids. This pattern, referred to as isolation asymmetry or Darwin's Corollary to Haldane's Rule, has been observed in taxa from plants to vertebrates, yet we still know little about which factors determine its magnitude and direction. Here, we show that differences in offspring size predict the direction of isolation asymmetry observed in crosses between populations of a placental fish, Heterandria formosa . In crosses between populations with differences in offspring size, high rates of hybrid inviability occur only when the mother is from a population characterized by small offspring. Crosses between populations that display similarly sized offspring, whether large or small, do not result in high levels of hybrid inviability in either direction. We suggest this asymmetric pattern of reproductive isolation is due to a disruption of parent–offspring coadaptation that emerges from selection for differently sized offspring in different populations.


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