Segregational Load in Drosophila Kikjsawai
نویسنده
چکیده
ATURAL populations of D. kikkawai Burla (previously cited as D. montium N d e Meijere) present three different types of polymorphism: (1) a polymorphism (associated with a sexual dimorphism) involving color and pattern of abdominal tergites; (2) a chromosomal polymorphism expressed in a long paracentric inversion in the left arm of chromosome 11; (3) a chromosome heteromorphism in consequence of the mitotic chromosome IV being found both as metacentric and as acrocentric. With respect to color and pattern of abdominal tergites, two genetically pure forms (light and dark) have been isolated. Crossing experiments showed that a single pair of autosomal alleles is mainly responsible for the differences between them, with dark pigmentation dominant. The two color forms are easily distinguished among females, but with difficulty among males. (For data, see FREIREMAIA 1964a,b.) In this paper, data on the color polymorphism and on the inversion polymorphism in natural populations will be presented and discussed. The problem of the chromosome heteromorphism will be only briefly touched, since no quantitative information was obtained concerning it.
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