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A sex-ratio meiotic drive system in Drosophila simulans. II: an X-linked distorter

Yun Tao1, Luciana Araripe, Sarah B Kingan

  • 1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, United States of America. ytao3@emory.edu

Plos Biology
|November 9, 2007
PubMed

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Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
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The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
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The Ratio of X Chromosome to Autosomes

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Dosage Compensation

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Meiosis II

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