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What is sex Index?...

What is sex Index?

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In Drosophila the sex is determined by the balance between the genes for femaleness located on the 'X' chromosome and those for maleness located on the 'autosomes' (A). Hence the sex of an individual is determined by the ratio of its X chromosome to that of the autosome A sets. This ratio is termed as sex index and is expressed as
`"Sex Index"="Number of X chromosomes"/"Number of sets of autosomes" ((X))/((A))`
change in this ratio leads to a changed sex phenotype.
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