Sex determination in drosophila
In Drosophila, males are XY, but sex not only depends on the presence of a Y chromosome. Drosophila is a diploid organism with a pair of sex chromosomes (XX or XY) and three autosomal pairs of chromosomes (two autosomal sets). Sex depends on the ratio of the number of X chromosomes to the number of autosome sets.
An X: A ratio of 1.00 or higher produces a female whereas an X: A ratio of 0.5 or lower produces a male. The X: A between 0.5 and 1.0 produces intersex.
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