The Y chromosome is inherited from father to son, and so follows the male line through the generations. Due to random sampling, Y chromosome genotypes get "lost", and so the number of different Y chromosome genotypes gradually decreases through the generations. This exercise simulates the process through the generations and the process can be followed to "fixation". It also can be repeated over and over, and so the variability in the process and the final outcome can be experienced. (The process is mathematically the same as in the "Mitochondrial Eve" q.v.) (Keywords: genetics evolution simulation)
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