Summary
A specific kind of sterile F1 female, denoted SF, arises when females from strains known as reactive are crossed with males from the complementary class of strains (inducer). It has been shown that this sterility results from the interaction between the maternal reactive cytoplasm and any one of the paternal inducer chromosomes. This interaction yields other dysgenic traits including non-disjunction and mutations.
In this note, the abilities of paternal gametes containing various combinations of inducer and reactive chromosomes to give more or less sterile SF females when fertilising standard reactive oocytes were compared. Although they did not cause SF sterility, reactive chromosomes, when present in sperm containing at least one inducer chromosome, were found to influence the intensity of sterility: variations of SF sterility were observed between SF females which differed only by one paternally inherited reactive chromosome.
Reactive chromosomes are known to control the cytoplasmic state of reactive females. The present results suggest that this chromosomal control also takes place in SF females.
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References
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Pélisson, A. The I-R system of hybrid dysgenesis in Drosophila melanogaster: influence on SF females sterility of their inducer and reactive paternal chromosomes. Heredity 43, 423–428 (1979). https://doi.org/10.1038/hdy.1979.92
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DOI: https://doi.org/10.1038/hdy.1979.92
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