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Mapping platypus SOX genes; autosomal location of SOX9 excludes it from sex determining role

M C Wallis1, M L Delbridge, A J Pask

  • 1Comparative Genomics Group, Research School of Biological Sciences, The Australian National University, Canberra, Australia.

Cytogenetic and Genome Research
|February 24, 2007
PubMed

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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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