A primitive Y chromosome in papaya marks incipient sex chromosome evolution

@article{Liu2004APY,
  title={A primitive Y chromosome in papaya marks incipient sex chromosome evolution},
  author={Zhiyong Liu and Paul H. Moore and Hao Ma and Christine M. Ackerman and Makandar Ragiba and Qingyi Yu and Heather M. Pearl and Minna Kim and Joseph W. Charlton and John I. Stiles and Francis T. Zee and Andrew H. Paterson and Ray Ming},
  journal={Nature},
  year={2004},
  volume={427},
  pages={348-352}
}
Many diverse systems for sex determination have evolved in plants and animals. One involves physically distinct (heteromorphic) sex chromosomes (X and Y, or Z and W) that are homozygous in one sex (usually female) and heterozygous in the other (usually male). Sex chromosome evolution is thought to involve suppression of recombination around the sex determination genes, rendering permanently heterozygous a chromosomal region that may then accumulate deleterious recessive mutations by Muller's… CONTINUE READING
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