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The Ratio of X Chromosome to Autosomes

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...

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Updated: Mar 1, 2026

A Direct and Simple Method to Assess Drosophila melanogaster's Viability from Embryo to Adult

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AVERAGE FITNESS OF POPULATIONS OF DROSOPHILA MELANOGASTER AS ESTIMATED USING COMPOUND-AUTOSOME STRAINS

Hans Jungen¹, D L Hartl²

¹University of Zürich, Zürich, Switzerland.

Evolution; International Journal of Organic Evolution

|June 2, 2017

Summary

No abstract available in PubMed .

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