X:A ratio
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The X:A ratio is the ratio between the X chromosome and the number of sets of autosomes in an organism.
This ratio is used primarily for determining sex of drosophila flies. Generally, a 1 X chromosome: 1 autosome ratio results in a female and x:A of 1:2 results in males. When calculating the ratio, Y chromosomes are ignored. For example, for a triploid drosophilathat has XXX, the ratio is 1:1 (3X's :3 autosomes since it is a triploid). For a diploid drosophila that has XY, the ratio is 1:2 (1 X: 2 autosomes since it is diploid).
