Studies on male recombination in a southern greek drosophila melanogaster population part c chromosomal abnormalities at male meiosis part d cytoplasmic factor responsible for the reciprocal cross effect/

Yannopoulos, G.

Genetical Research 31(2): 187-196


Accession: 006509272

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A combined cytological and genetic analysis was carried out to determine whether the spontaneous male recombination association with a line of D. melanogaster derived from Southern Greece (31.1 MRF) involves chromosome breakage and random reunion. In all crosses showing male recombination, extensive abnormalities involving anaphase bridges and fragments were found at 1st and 2nd meiotic divisions. This confirms that the low level of recombination associated with male recombination lines is not produced by normal, controlled crossing-over of the type found in females, but by chance reunions, following more erratic breakage events at 1st and 2nd anaphase. The occurrence of some limited premeiotic recombination also cannot be excluded. The 31.1 MRF system shows higher recombination levels at elevated temperature ( C) and chromosome abnormality frequency is also greatly increased. The 31.1 MRF induces both male recombination and chromosomal abnormalities at meiosis when it is inherited from females deriving their cytoplasm from stock other than CyL4/Pm. This factor acts independently of sex; the reciprocal cross effect is caused by a cytoplasmic factor which the 31.1/CyL4 strain inherited from the CyL4/Pm stock.