Journal
GENETICS
Volume 180, Issue 2, Pages 957-967Publisher
GENETICS SOCIETY AMERICA
DOI: 10.1534/genetics.108.092379
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Funding
- German Academic Exchange Service
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A typical pattern in sex chromosome evolution is that Y chromosomes are small and have lost many of their genes. One mechanism that might explain the degeneration of Y chromosomes is Muller's ratchet., the perpetual stochastic loss of linkage groups carrying the fewest number of deleterious mutations. This process has been investigated theoretically mainly for asexual, haploid populations. Here, I Construct a model of a sexual Population where deleterious mutations arise on both X and Y chromosomes. Simulation results of this model demonstrate that mutations on the X chromosome can considerably slow down the ratchet. On the other hand, a lower mutation rate in females than in males, background selection, and the emergence of dosage compensation are expected to accelerate the process.
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