as areas of recombination suppression.

Originally, these inversions were noted in polytene chromosomes within the salivary glands of heterozygous Drosophila melanogaster larvae. In 1970, Theodosius Dobzhansky noted that genes within an inversion had higher fitness than those that are found outside of the inversions, although this is an area that needs further study.

One of the more recent models of inversions is the Kirkpatrick and Barton

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