The Effects of Unequal Crossing over at the Bar Locus in Drosophila.
نویسنده
چکیده
TABLE OF CONTENTS PAGE INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Historical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Mutations and crossing over. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 Frequency of bar mutation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 The crossover values for forked, bar and fused. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Facet number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
منابع مشابه
Population genetics of tandem repeats in centromeric heterochromatin: unequal crossing over and chromosomal divergence at the Responder locus of Drosophila melanogaster.
The Responder (Rsp) locus in Drosophila melanogaster is the target locus of segregation distortion and is known to be comprised of a tandem array of 120-bp repetitive sequences. In this study, we first determined the large scale molecular structure of the Rsp locus, which extends over a region of 600 kb on the standard sensitive (cn bw) chromosome. Within the region, small Rsp repeat arrays are...
متن کاملAnotiier Case of Unequal Crossing-over in Drosophila Melanogaster
Females homozygous for the sex-linked dominant, Bar, occasionally give rise to wild-type reversions and to forms with more extreme eye reduction than Bar. This behavior was shown by Sturtevant' to result from unequal crossing-over. The Bar-reverted type was considered to be a deficiency for the Bar gene; while the extreme form, called Ultra-Bar or Double-Bar, was interpreted as a duplication fo...
متن کاملThe Relation of a Dominant Eye Color in Drosophila Melanogaster to the Associated Chromosome Rearrangement.
The possibility that the developmental effects of genes are influenced by their neighbors in the chromosomes has only recently become accessible to experiment. The first demonstration of such an effect was given by STURTEVANT (1925). Two Bar genes in Drosophila melanogaster, placed in the same chromosome as a result of unequal crossing over, are more effective than two similar genes present in ...
متن کاملA Further Study of the so-Called Mutation at the Bar Locus of Drosophila.
PAC;]: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTRODUCTION.. 431 Time of occurrence of bar mutation.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Relative numbers of reversions and d...
متن کاملExchanges at the bobbed locus of Drosophila melanogaster.
I N this paper evidence will be presented that crossing over at the bobbed (bb) locus of Drosophih melanogaster generates a variety of mutant alleles. Some of these alleles are distinguishable from one another and their parental alleles in the degree of their effect as judged by bristle size, abdominal etching and viability. These observations are in harmony with the genetic organization of the...
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ورودعنوان ژورنال:
- Genetics
دوره 10 2 شماره
صفحات -
تاریخ انتشار 2003