Journal of Genetics

, 55:218 | Cite as

The conditions for coadaptation in polymorphism for inversions

  • J. B. S. Haldane


Criteria are found for the stability of a balanced polymorphism due to chromosomal inversions in autosomes. Roughly speaking, it is necessary that heterosis should be cumulative, that is to say that heterozygosis at any locus concerned in the genetical polymorphism should have a greater effect in raising fitness when the other loci concerned are heterozygous than when they are homozygous. The conditions when one inversion carries a sex-determining mechanism are much less stringent. Here a single gene may be enough to make an inversion selectively advantageous.


Chromosomal Inversion Inverted Segment Chromosomal Section Fitness Fitness Inadequate Food Supply 
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Copyright information

© Indian Academy of Sciences 1957

Authors and Affiliations

  • J. B. S. Haldane
    • 1
  1. 1.Department of BiometryUniversity College LondonLondon

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