Open AccessGenetics of inbred Drosophila melanogaster
Author(s) -
LÜNING K. G.
Publication year - 1986
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1986.tb00534.x
Subject(s) - biology , genetics , x chromosome , drosophila melanogaster , inbred strain , chromosome , gene
The aim of the present tests was to examine the occurrence of paternal primary non‐disjunction in males from three inbred lines, “2”, “12” and “K”, with the genome in cytoplasm of various origin. In all tests, females from the y w a f‐2 line were mated to w/B S Y y + males. The use of a Y‐chromosome with marker genes in both arms revealed a complex pattern of exceptionals of paternal origin. Besides primary non‐disjunction (XXY and X0) there also occurred those with one of the marker genes in the Y‐chromosome, X/Y L and X/Y S , with a great excess of the latter. Clusters appeared which in the majority had both phenotypic w a B (X/Y L ) and w a f (X/Y S ) exceptionals indicating mitotic recombination between the X‐ and the Y S ‐arm of the Y‐chromosome. Parental sets without clusters gave fairly high numbers of single X/Y S males. Phenotypic w a B females included, besides true XXY, also X/X. Y L genotypes. Thus, the frequencies of w a B females gave maximum values of primary non‐disjunction. Lines “12” and “K” gave much lower primary non‐disjunction in males than in the females of the same lines while line “2” gave higher values both as compared to females of the same line and to males of the other two lines. The “2” line also gave an excess of X0 males, which is contrary to all former tests of intra‐strain crosses.