Adaptive evolution and explosive speciation: the cichlid fish model. Kocher envisions a complementary scenario in which new sex-determining systems and associated sex-specific color patterns are favored during different stages of population growth, after founder events due to changes in lake levels.
Another 12 markers that contained one heterozygous parental genotype were removed, as well as seven others with low genotyping success in either parental or F 2 individuals. Cichlid fish diversity threatened by eutrophication that curbs sexual selection. We observed a blue color among male F 2 that was not seen in either of the parental individuals see Figure 1 but is a known nuptial phenotype common in these and other LM species Ribbink et al.
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We detect a complex epistatic sex system consisting of a major female heterogametic ZW locus on chromosome 5, two separate male heterogametic XY loci on chromosome 7, and two additional interacting loci on chromosomes 3 and Genetic conflict and sex chromosome evolution.
The RAD libraries for each parent were assembled, aligned and alternately fixed SNPs were identified and selected for genotyping in the intercross population F 2. The lower portion of the table represents the results of dropping a factor from the model one at a time.