The fertility effects of pericentric inversions in Drosophila melanogaster

Article Abstract:

Pericentric inversions in D. melanogaster were studied to determine their effect on the fertility of female heterokaryotypes. Thirty third-chromosome inversions and seven second-chromosome inversions were obtained and used for the study. Reduction in egg viability was found to be 20% and smaller than other reported values and the position of inversion affected egg viability. Heterozygotes with breakpoints near the middle of each arm had less cases of egg inviability. The highest correlation values for sensitive sites was around division 70 on 3L and division 90 on 3R. Pericentric inversions did not reduce fertility.

Inversion (Genetics)

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A cytogenetic analysis of chromosomal region 31 of Drosophila melanogaster

Article Abstract:

A cytogenetic study conducted on chromosomal region 31 of the second chromosome of Drosophila melanogaster isolated 139 new hemizygous lethal mutations which did not complement Df(2L)J2 (31A-32A). In combination with preexisting mutations, these mutations were used to identify 35 new complementation groups. Newly identified deficiencies were used for localizing three non-histone chromosomal protein-encoding loci. The study was able to more accurately determine and characterize the position of mutations which interact with heterochromatin within the cell.

Chromosome mapping, Cytogenetics

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A cytogenetic and genetic characterization of a group of closely linked second chromosome mutations that suppress position-effect variegation in Drosophila melanogaster

Article Abstract:

An extensive cytogenetic and genetic analysis of a group of dominant Su(var) mutants found in the left arm (2L) of chromosome 2 was reported. Nine mutants of the group defined three genes wherein two were located in section 31 of 2L while the other gene was found in near this region. Significant phenotypic characteristics shared by the mutants included dominant maternal effects, recessive lethality or semilethality, female infecundity, sensitivity to amount of heterochromatin in the cell and sensitivity to sodium butyrate.

Mutation (Biology), Mutation, Chromosomes

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