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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
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Published on: January 20, 2015

Sexual dimorphism in number and proportion of neurons in the human median raphe nucleus

M E Cordero1, C Y Valenzuela, R Torres

  • 1Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.

Brain Research. Developmental Brain Research
|December 13, 2000
PubMed

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The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

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.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...