Department of Biology, University of Rochester, Rochester, NY 14627, USA.
Curr Biol. 2013 Sep 23;23(18):R848-50. doi: 10.1016/j.cub.2013.08.021.
Heteromorphic sex chromosomes are thought to represent a terminal evolutionary endpoint due to their specialized gene content and chromosome-specific regulation. New findings, however, show that an ancient X chromosome reverted to an autosome in the lineage leading to Drosophila.
异型性染色体被认为代表了进化的终点，因为它们具有特殊的基因组成和染色体特异性调控。然而，新的发现表明，在果蝇的进化过程中，一条古老的 X 染色体在谱系中退回到了常染色体。
