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The Role of the Y Chromosome in Evolution
There are lots of sexually dimorphic jumping spiders that don't have a Y chromosome. In habrinatus, those groups of species that have the most complex courtship dances in fact, those that seem to have evolved the Y chromosome most often. The spectacular thing is when you see convergence, as you do with jumping spider dances and chromosomes and so forth, is that you start to realize that there are certain repeated patterns,. Those repeated patterns show up in one lineage. They show up in another lineage. And there might have been a certain sequence in each case.