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, 2008). Several homomorphic intercourse chromosomes tend to be young [e.grams. within medaka (Kondo et?al., 2001) as well as stickleback (Peichel et?al., #links# '04)], as well as in these situations, there may not even are already enough time to the X along with Y to be able to diverge. Additional homomorphic sex chromosomes, however, tend to be aged. A number of culicid nasty flying bugs (Rai,