SEX AND CROSSING OVER IN LINKAGE GROUP IV OF TRIBOLIUM CASTANEUM

Genetics ◽  
1972 ◽  
Vol 72 (3) ◽  
pp. 525-530
Author(s):  
Peter S Dawson
Keyword(s):  
Linkage Group ◽  
Tribolium Castaneum ◽  
Group Iv ◽  
Crossing Over

SEX AND CROSSING OVER IN LINKAGE GROUP III OF TRIBOLIUM CASTANEUM

1977 ◽  
Vol 19 (2) ◽  
pp. 259-263 ◽  
Author(s):  
Alexander Sokoloff
Keyword(s):  
Sex Differences ◽  
Linkage Group ◽  
Tribolium Castaneum ◽  
Relative Position ◽  
Genetic Background ◽  
Crossing Over ◽  
Group Iii ◽  
The Third ◽  
Main Factors ◽  
Coleoptera Tenebrionidae

The relative position of the genes black (b), light ocular diaphragm (lod) and aureate (au) for the third linkage group of T. castaneum (Herbst) (Coleoptera, Tenebrionidae) has been determined as b – lod – au. The distances between the various genes vary, depending on the cross. The b++/+ lod au ♂ × + lod au/+ lod au ♀ crosses give the following recombination values: au – lod = 18.32 ± 1.21%; b – lod = 21.05 ± 1.51% and b – au = 37.43 ± 1.27%. The reciprocal crosses give au – lod = 27.67 ± 1.62%; b – lod = 13.97 ± 1.26% and b – au = 39.79 ± 1.78%. For the larger distances encompassed in the b – au region the recombination values in the two sexes were not significantly different. For the shorter b – lod region the recombination values were significantly larger in the females than in the males, while for the adjacent lod – au region the opposite was true. On the basis of the current literature it would appear that the main factors contributing to these sex differences in recombination are the modifiers which are different in the genetic background of the two sexes.

LINKAGE GROUP IV OF TRIBOLIUM CASTANEUM

1972 ◽  
Vol 14 (3) ◽  
pp. 675-680 ◽  
Author(s):  
Peter S. Dawson
Keyword(s):  
Linkage Group ◽  
Tribolium Castaneum ◽  
Group Iv ◽  
Eye Color ◽  
Flour Beetle ◽  
Color Mutant ◽  
White Locus ◽  
Fourth Pair

A new recessive eye color mutant, hazel, of the flour beetle, Tribolium castaneum, has been mapped in linkage group IV near the white locus, thus establishing the existence of a fourth pair of closely linked eye color genes in this species. A revision of linkage group IV is proposed.

scholarly journals A MUTANT AFFECTING MEIOSIS IN NEUROSPORA

Genetics ◽  
1975 ◽  
Vol 80 (1) ◽  
pp. 125-133
Author(s):  
David A Smith
Keyword(s):  
Linkage Group ◽  
Meiotic Division ◽  
Group Iv ◽  
Black Pigment ◽  
Crossing Over ◽  
Wild Type ◽  
Linkage Groups ◽  
Recessive Mutant ◽  
Ascospore Production

ABSTRACT Many mutants affecting meiosis increase the occurrence of aneuploid meiotic products. In Neurospora, mutants of this type cause ascospore abortion which is reflected by an increase in the proportion of ascospores failing to develop black pigment. The usefulness of the criterion white-ascospore-production as a signal for the presence of a mutant affecting meiosis is demonstrated by the recovery of several such mutants. One of these is mei-1 (meiotic-1), a recessive mutant on linkage group IV. Crosses homozygous for mei-1 produce 90% white ascospores (vs. 5% in wild-type crosses). Viable ascospores, invariably black, are always disomic for one or more linkage groups; the chromatids assorted into viable ascospores do not engage in crossing over in meiosis. The distribution of viable ascospores in individual asci suggests that all meioses are defective in the first meiotic division, and that most meioses are defective in both divisions.

The "reindeer" mutation and a revision of linkage groups V and X in the flour beetle, Tribolium castaneum

1984 ◽  
Vol 26 (6) ◽  
pp. 762-764 ◽  
Author(s):  
Peter S. Dawson
Keyword(s):  
Linkage Group ◽  
Key Words ◽  
Tribolium Castaneum ◽  
Linkage Groups ◽  
Dominant Mutation ◽  
Genetic Studies ◽  
Group V ◽  
Flour Beetle ◽  
Dominant Mutants

Reindeer (Rd) is a dominant mutation affecting antenna morphology in the tenebrionid flour beetle, Tribolium castaneum. In contrast with most dominant mutants previously described for this species, homozygotes are fully viable, thus making Rd very useful for genetic studies. Rd is tentatively assigned to either linkage group IX or X. Abbreviated appendages (aa), formerly placed in linkage group X, is reassigned to linkage group V on the basis of demonstrated linkage to jet (j).Key words: Tribolium, mutation Rd, linkage, antenna morphology.

scholarly journals Chromosome Extraction and Revision of Linkage Group 2 in Tribolium castaneum

1996 ◽  
Vol 87 (3) ◽  
pp. 224-232 ◽  
Author(s):  
R. W. Beeman ◽  
J. J. Stuart ◽  
M. S. Haas ◽  
K. S. Friesen
Keyword(s):  
Linkage Group ◽  
Tribolium Castaneum ◽  
Group 2

CAENORHABDITIS ELEGANS DEFICIENCY MAPPING

Genetics ◽  
1984 ◽  
Vol 108 (2) ◽  
pp. 331-345
Author(s):  
D Christine Sigurdson ◽  
Gail J Spanier ◽  
Robert K Herman
Keyword(s):  
Caenorhabditis Elegans ◽  
Linkage Group ◽  
Ethyl Methanesulfonate ◽  
Single Site ◽  
Crossing Over ◽  
Wild Type ◽  
Nematode Caenorhabditis Elegans ◽  
Recessive Lethal ◽  
X Ray ◽  
New Mutations

ABSTRACT Six schemes were used to identify 80 independent recessive lethal deficiencies of linkage group (LG) II following X-ray treatment of the nematode Caenorhabditis elegans. Complementation tests between the deficiencies and ethyl methanesulfonate-induced recessive visible, lethal and sterile mutations and between different deficiencies were used to characterize the extents of the deficiencies. Deficiency endpoints thus helped to order 36 sites within a region representing about half of the loci on LG II and extending over about 5 map units. New mutations occurring in this region can be assigned to particular segments of the map by complementation tests against a small number of deficiencies; this facilitates the assignment of single-site mutations to particular genes, as we illustrate. Five sperm-defective and five oocyte-defective LG II sterile mutants were identified and mapped. Certain deficiency-by-deficiency complementation tests allowed us to suggest that the phenotypes of null mutations at two loci represented by visible alleles are wild type and that null mutations at a third locus confer a visible phenotype. A segment of LG II that is about 12 map units long and largely devoid of identified loci seems to be greatly favored for crossing over.

Analysis of lethal mutations induced in a mutator strain that activates transposable elements in Caenorhabditis elegans

Genome ◽  
1990 ◽  
Vol 33 (1) ◽  
pp. 109-114 ◽  
Author(s):  
Denise V. Clark ◽  
Robert C. Johnsen ◽  
Kim S. McKim ◽  
David L. Baillie
Keyword(s):  
Caenorhabditis Elegans ◽  
Linkage Group ◽  
Gamma Ray ◽  
Hot Spot ◽  
Single Gene ◽  
Gene Mutations ◽  
Group Iv ◽  
Group V ◽  
Mutator Strain ◽  
Lethal Mutations

A screen was conducted for lethal mutations in the nematode Caenorhabditis elegans in a strain containing the mutator mut-4(st700)I to examine the nature of mutator-induced lethal mutations within two large chromosomal regions comprising a total of 49 map units (linkage group IV (right) and linkage group V (left)). The genetic analysis of 28 lethal mutations has revealed that the mutator locus mut-4(st700)I causes both putative single-gene mutations and deficiencies. We have identified lethal mutations in three different genes, in addition to seven deficiencies. There is a mutational hot spot on linkage group V (left) around the lin-40 locus. Six mutations appear to be alleles of lin-40. In addition, 5 of 7 deficiencies have breakpoints at or very near lin-40. All seven deficiencies delete the left-most known gene on linkage group V (left) and thus appear to delete the tip of the chromosome. This is in contrast to gamma ray and formaldehyde induced deficiencies, which infrequently delete the closest known gene to the tip of a chromosome.Key words: Caenorhabditis elegans, mutator, deficiencies, lethal mutations.

Linkage of the reindeer and alate prothorax loci and sex differences in recombination frequency in linkage group IX of Tribolium castaneum

1985 ◽  
Vol 27 (3) ◽  
pp. 276-278
Author(s):  
Peter S. Dawson ◽  
Kelly L. Berends
Keyword(s):  
Sex Differences ◽  
Linkage Group ◽  
Tribolium Castaneum ◽  
Autosomal Dominant ◽  
Recombination Frequency ◽  
Flour Beetle ◽  
The Third ◽  
Dominant Mutant

Reindeer (Rd), an autosomal dominant mutant in the flour beetle, Tribolium castaneum, is located in linkage group IX. Recombination between Rd and alate prothorax occurs more frequently in males than in females. Linkage group IX appears to be the third linkage group for which recombination frequency is greater in males for one region and in females for another region of the chromosome.Key words: Tribolium, linkage.

LINKAGE STUDIES IN TRIBOLIUM CASTANEUM. XI. THE MAP POSITION OF CHARCOAL, A PSEUDOALLELE OF BLACK

1978 ◽  
Vol 20 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Eric Brown ◽  
Alexander Sokoloff
Keyword(s):  
Linkage Group ◽  
Tribolium Castaneum ◽  
Reciprocal Cross ◽  
Autosomal Dominant ◽  
Linkage Studies ◽  
Lethal Effects ◽  
Recessive Lethal ◽  
Reciprocal Crosses ◽  
Group Iii ◽  
Significant Difference

Charcoal, (Chr), an autosomal dominant with recessive lethal effects is located in linkage group III in Tribolium castaneum (Herbst). Its map position has been determined in respect to aureate (au), light ocular diaphragm (lod) and black (b). The distances between the various genes vary, depending on the sex of the cross. The Chr ++/+ lod au ♂ × +lod au/+lod au ♀ crosses give the following recombination values: au-lod = 22.19 ±.42%, Chr-lod = 20.03 ±.40% and Chr-au = 41.28 ±.49%. The reciprocal crosses give au-lod 28.08 ±.45%, Chr-lod = 17.67 ±.38% and Chr-au = 44.11 ±.50%. For the larger distances encompassed by the Chr-au region the recombination values in the two sexes were not significantly different. For the shorter distances the recombination values were significantly higher in the males than in the females in the au-lod region. They were not found to be significantly different in the Chr-lod region probably because of difficulty in identifying lod and non-lod beetles in the presence of Chr. Tests of allelism indicate that Chr and black b are pseudoalleles which recombine at a different rate in the two sexes. Chr +/+b ♂ × +b/+b ♀ gave 0.07% recombinants, while the reciprocal cross gave 0.014% recombinants, a significant difference. The data suggest that the order of the genes in this linkage group is Chr - b - lod - au.

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