Where sexes come by the thousands
The split gill mushroom _Schizophyllum commune_, a fungal species that includes more than 20,000 sexes. Bernard SpraggBy the end of every spring semester, students in my introductory biology course at Vanderbilt University have become quite familiar with natural variation in human sex chromosomes. They know, for example, that most females have two X chromosomes and most males have one X and one Y chromosome. But in every thousand humans, there are typically a few whose biological sex doesn’t mat
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