Abstract
IN Drosophila pseudoobscura a genetic factor has previously been described1, the only observable effect of which is to cause a small change in the banding pattern of the third polytene chromosome. This factor behaves in crosses as a simple recessive gene, and has been named ‘salivary’ (sal). Because of the recondite nature of its effect, sal may be considered an isoallele of a gene for normal banding pattern.
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VAN VALEN, L., LEVINE, L. Natural Selection on an Isoallele. Nature 200, 1236–1237 (1963). https://doi.org/10.1038/2001236a0
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DOI: https://doi.org/10.1038/2001236a0
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