Gametic non-random associations in North-West African populations ofDrosophila melanogaster

Abstract

Three North-west African populations of Drosophila melanogaster were analyzed for chromosomal and enzyme polymorphism as well as for gametic associations between non allelic elements mapped on the same chromosome arm. Strong geographic heterogeneity was found between populations, both for enzyme and chromosomal polymorphism. Out of the 43 possible comparisons for gametic association, 14 (32.5%) were statistically significant.

Association among quantitative, chromosomal and enzymatic traits in a natural population of Drosophila melanogaster

“…In this study only 1 such complex rearrangement was found, that being the common cosmopolitan In (3L)P and the endemic In (3L)6/,C;69F occurring in the same chromosome. Another overlapping inversion had previously been found in this same locality but affecting the 2L arm (Afonso et al, 1985). In an inversion distribution, 8 Afonso et al, 1985).…”

“…Another overlapping inversion had previously been found in this same locality but affecting the 2L arm (Afonso et al, 1985). In an inversion distribution, 8 Afonso et al, 1985). This difference is attributable to differences in sample size, which is 20 times greater in this study.…”

Correlated variation of chromosomal inversion (3R)C and extra bristles in Drosophila melanogaster

“…Afonso et al, 1985). Other authors explain inversion polymorphisms by a selective advantage of heterokaryotypes (e.g.…”

Association among quantitative, chromosomal and enzymatic traits in a natural population of Drosophila melanogaster

“…For each locus and chromosome arm, the differences between the coefficients of variation for the morphological character in homozygous and heterozygous groups were calculated, and the Wilcoxon's signed-ranks test (Sokal and Rohlf, 1981) (Afonso et al, 1985) ; and 27 new endemic rare inversions. Three of these new inversions were found on chromosome X which is usually monomorphic in wild populations of D melanogaster (Ashburner and Lemeunier, 1976) although Stalker (1976) also found X polymorphism in American samples.…”