ISSN:
1432-0886
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Abstract Light and electronmicroscope studies indicate that Eusimulium aureum (n=2 metacentrics) is male-achiasmate. Supporting evidence for achiasmate meiosis includes lack of recombination between, I) widely separated differential segments of X and Y chromosomes and 2) linked autosomal inversions. In sibling C, chromosome II exists in an alternate “neoacrocentric” form interpreted as originating through the three-break shift of a small segment including centromere and nucleolar organizer. Male-achiasmate meiosis appears to be a prerequisite for the establishment of rearrangements that include large displacements of the centromere. This suggestion is supported by a correlation between achiasmate male meiosis and the fixation of gross pericentric changes in a number of other black fly species.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00319829
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