X-RAY INDUCED PERICENTRIC INVERSIONS IN ANOPHELES ALBIMANUS

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Abstract
Sixteen different pericentric inversions, 10 on chromosome 2 and 6 on chromosome 3, were isolated and characterized. The partial sterility in the inversion heterozygotes ranged from about 28-50%. Contrary to theoretical considerations, a curvilinear relationship exists between inversion length and partial sterility, whereby a reduction in sterility was noted for progressively longer inversions. The break-points are distributed randomly over the autosomes, but are observed more frequently in the areas of the salivary gland chromosomes where diffuse and broken bands of variable stainability are located.