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Mention genic balance theory of sex determination.

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Detailed Solution

  • Genic balance theory was proposed by Bridges to explain sex determination in Drosophila.
  • According to this theory, the sex is determined by the balance between genes for femaleness located on X-chromosomes and genes for maleness located on autosomes.
     Sex index (X/A ratio )= no. of X chromosomes  no. of sets of autosomes 
  • If X/A ratio is 1, Drosophila is a female.
  • If ratio is 0.5 it is male.
  • If ratio is >1 it is meta female, if ratio is < 0.5 meta male, 0.66 it is intersex.
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Mention genic balance theory of sex determination.