Evolution: from autosomes to sex chromosomes--and back.
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.
Department of Biology, University of Rochester, Rochester, NY 14627, USA.
Emily L
EL
Landeen
Daven C
DC
Presgraves
D000818:Animals; D059006:Chromosomes, Insect; D004330:Drosophila / Q000235:genetics*; D005260:Female; D008297:Male; D012730:Sex Chromosomes