A paper in PLoS Biology this week: Accelerated Adaptive Evolution on a Newly Formed X Chromosome unravels the history of the X chromosomeSex chromosomes have evolved independently many times in both animals and plants from ordinary chromosomes. Much research on sex chromosome evolution has focused on the degeneration and loss of genes from the Y chromosome. Here, we describe another principle of sex chromosome evolution: bursts of adaptive fixations on a newly formed X chromosome.
UC Berkeley had a press release that summarizes the work quite nicely.
There were a number of relevant posts last year on the whole sex/mating/development issue:
- Haplodiploidy in social insects
- Question of the day
- Girls will be boys
- Channel 4
- Sniff and swim
- Miracle of life
- How do biologists ever reproduce?
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