Songbirds have a species quantity nearly equal to compared to animals, and are usually classic models for studying mechanisms of speciation and selection that is sexual. Intercourse chromosomes are hotspots of both procedures, yet their evolutionary history in songbirds continues to be confusing. To elucidate that, we characterize feminine genomes of 11 songbird types having ZW sex chromosomes, with 5 genomes of bird-of-paradise species newly stated in this work. We conclude that songbird sex chromosomes have withstood at the very least four actions of recombination suppression before their species radiation, creating a gradient pattern of pairwise series divergence termed ‘evolutionary strata’. Interestingly, the latest stratum probably emerged because of a songbird-specific rush of retrotransposon CR1-E1 elements at its boundary, or chromosome inversion in the W chromosome. The development of evolutionary strata has reshaped the architecture that is genomic of intercourse chromosomes. We find stepwise variations of Z-linked inversions, repeat and GC articles, along with W-linked gene loss price which are linked to the chronilogical age of strata. Continue reading “Powerful history that is evolutionary gene content of intercourse chromosomes across diverse songbirds”
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