SELECTION FOR REDUCED CROSSING OVER IN DROSOPHILA MELANOGASTER

[摘要] Selection was practiced for reducing crossing over between the third chromosome genes Sb and H 2 of Drosophila melanogaster , the method employed was to select the repulsion double heterozygotes Sb +/+ H 2 every generation. Two replicate selection lines were maintained. After 24 generations of selection, Line 1 showed no significant difference from the control, although the regression of recombination value on generation was significant. In generation 20, Line 2 had a significantly lower recombination value than the control, as well as having a highly significant regression coefficient. No chromosome rearrangements were involved in the response. It was concluded that there was substantial genic variability in the frequency of crossing over between Sb and H 2 in the base population.

[学科分类] 医学（综合）