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Articles 301 - 313 of 313
Full-Text Articles in Genetics and Genomics
Speciation In The Aedes Triseriatus Species Complex., David B. Taylor
Speciation In The Aedes Triseriatus Species Complex., David B. Taylor
David B. Taylor
Interspecific hybridization was used to determine the genetic relationships between the four species of mosquitoes in the Triseriatus and Zoosophus groups of the aedine subgenus Protomacleaya (Diptera : Culicidae) . Four factors were investigated : 1) fertility of intra- and interspecific crosses, 2) morphology of the interspecific hybrids and the genetic bases of morphological characters, 3) modes of postcopulatory reproductive isolation and 4) types of chromosomal changes occurring during and subsequent to the divergence of the species .
Hybrid progeny were produced in 11 of the 12 possible crosses between the four species . Only the Aedes zoosophus female X …
Fine Structure Of The Nucleus And Cytoplasmic Feulgen-Positive Areas In The Developing Oocyte Of Argus (Persicargas) Radiatus, Bonnie J. Harding
Fine Structure Of The Nucleus And Cytoplasmic Feulgen-Positive Areas In The Developing Oocyte Of Argus (Persicargas) Radiatus, Bonnie J. Harding
Biological Sciences Theses & Dissertations
A transmission electron microscope analysis of the changes that occur in the nuclear chromatin and the Feulgen-positive areas of the oocyte cytoplasm as the female develops, feeds and mates is described. The description includes analysis of oocytes from three types of females: unfed, unmated; fed, unmated; and fed, mated. In all types, dense material passes through the extremely porous nuclear membrane where it accumulates in the cytoplasm.
Nuclei of previtellogenic oocytes appear the same in all females studied. Fibrillar bodies and up to four large nucleoli are seen. No typical chromatin is seen, but structures resembling nucleosomes appear throughout the …
Eatonia No. 20, May 05, 1975, William L. Peters, Janice Peters
Eatonia No. 20, May 05, 1975, William L. Peters, Janice Peters
Eatonia
Eatonia was a newsletter established to facilitate communication among scientists working on a group of aquatic insects in the order Ephemeroptera, more commonly known as mayflies. The newsletter is named after Rev. Alfred E. Eaton who studied mayflies in England in the late 1800’s and is considered the “father” of the modern classification of mayflies.
Eatonia Sup. 01, Jan. 05, 1975, William L. Peters, Janice Peters
Eatonia Sup. 01, Jan. 05, 1975, William L. Peters, Janice Peters
Eatonia
Eatonia was a newsletter established to facilitate communication among scientists working on a group of aquatic insects in the order Ephemeroptera, more commonly known as mayflies. The newsletter is named after Rev. Alfred E. Eaton who studied mayflies in England in the late 1800’s and is considered the “father” of the modern classification of mayflies.
Somatic Pairing In Drosophila Virilis Mitosis, William C. Guest
Somatic Pairing In Drosophila Virilis Mitosis, William C. Guest
Journal of the Arkansas Academy of Science
In neuroblast cells homologous chromosomes tend to pair during prophase of mitosis. Heterochromatic elements of homologous chromosomes are widely separated in very early prophase, at which time the euchromatin is poorly stained. Pairing is intimate for euchromatic portions of chromosomes in early and middle prophase with chiasmata frequently present. Homologous chromosomes most commonly lie side-by-side in late prophase and metaphase. Statistical data are presented to show the frequency of intimate pairing in prophase and side by side pairing in metaphase.
The Α-Glycerophosphate Cycle In Drosophila Melanogaster Iv. Metabolic, Ultrastructural, And Adaptive Consequences Of Αgpdh-1 "Null" Mutations, Stephen J. O'Brien, Yoshio Shimada
The Α-Glycerophosphate Cycle In Drosophila Melanogaster Iv. Metabolic, Ultrastructural, And Adaptive Consequences Of Αgpdh-1 "Null" Mutations, Stephen J. O'Brien, Yoshio Shimada
Biology Faculty Articles
"Null" mutations previously isolated at the αGpdh-1 locus of Drosophila melanogaster, because of disruption of the energy-producing α-glycerophosphate cycle, severely restrict the flight ability and relative viability of affected individuals. Two "null" alleles, αGpdh-1BO-1-4, and αGpdh-1BO-1-5, when made hemizygous with a deficiency of the αGpdh-1 locus,Df(2L)GdhA, were rendered homozygous by recombination with and selective elimination of the Df(2L)GdhA chromosome. After over 25 generations, a homozygous αGpdh-1BO-1-4stock regained the ability to fly despite the continued absence of …
The Α-Glycerophosphate Cycle In Drosophila Melanogaster. Iii. Relative Viability Of "Null" Mutants At The Α-Glycerophosphate Dehydrogenase-1 Locus, Stephen J. O'Brien, Bruce Wallace, Ross J. Macintyre
The Α-Glycerophosphate Cycle In Drosophila Melanogaster. Iii. Relative Viability Of "Null" Mutants At The Α-Glycerophosphate Dehydrogenase-1 Locus, Stephen J. O'Brien, Bruce Wallace, Ross J. Macintyre
Biology Faculty Articles
No abstract provided.
The Cytogenetics Of The Salivary Gland Chromosomes Of Three Wild Type Strains Of Drosophila Melanogaster, Rosemary Ann Harris
The Cytogenetics Of The Salivary Gland Chromosomes Of Three Wild Type Strains Of Drosophila Melanogaster, Rosemary Ann Harris
Masters Theses
This investigation involves the cytogenetics of three strains of field-collected, wild-type Illinois Drosophila melanogaster. These three strains were collected from Charleston, Channahon, and Olney, Illinois, in 1967.
The purpose of this study was to compare cytogenetically these three strains and to determine if there exists differences among them. First, the chromosomes themselves were studied for the purpose of identifying the four chromosomes of D. melanogaster by their characteristic banding patterns. Then, the chromosomes of the three strains were examined for chromosomal aberrations, principally inversions. The cytogenetics of the chromosomes of the three strains were then compared and contrasted.
Photographs …
An Analysis Of Gene-Enzyme Variability In Natural Populations Of Drosophila Melanogaster And D. Simulans, Stephen J. O'Brien, Ross J. Macintyre
An Analysis Of Gene-Enzyme Variability In Natural Populations Of Drosophila Melanogaster And D. Simulans, Stephen J. O'Brien, Ross J. Macintyre
Biology Faculty Articles
Nine populations of D. melanogaster and two populations of D. simulans were analyzed for polymorphism in 10 gene-enzyme systems by the technique of gel electrophoresis. In the eight natural populations of D. melanogaster, an average of 54% of the enzymes were polymorphic, and the average heterozygosity was 22.7%. An experimental population of D. melanogaster, which has been maintained in a laboratory cage for 20 years, showed levels of polymorphism equivalent to those of natural populations. The D. simulans populations had much less variability. The possible factors involved in maintaining these polymorphisms are discussed.
Competition And Natural Selection Among Laboratory And Naturally Occurring Populations Of Drosophila Melanogaster, John M. Connor
Competition And Natural Selection Among Laboratory And Naturally Occurring Populations Of Drosophila Melanogaster, John M. Connor
Masters Theses
No abstract provided.
The Webworm. 2. The Biology Of The Webworm, J A. Button
The Webworm. 2. The Biology Of The Webworm, J A. Button
Journal of the Department of Agriculture, Western Australia, Series 4
A detailed knowledge of the seasonal history of an insect pest is essential for an understanding of the way in which it is affected by various management and cultural practices.
Grasshoppers And Locusts In Western Australia, Clee Francis Howard Jenkins
Grasshoppers And Locusts In Western Australia, Clee Francis Howard Jenkins
Journal of the Department of Agriculture, Western Australia, Series 4
GRASSHOPPERS and locusts are among the most ancient enemies of the farmer, for they figured prominently in Biblical times, and periodically throughout the ages have devastated crops in all parts of the world.
Alfred E. Eaton - Father Of Modern Classification Of Mayflies, Late 1800'S, P. Barnard
Alfred E. Eaton - Father Of Modern Classification Of Mayflies, Late 1800'S, P. Barnard
Eatonia
This is the only known photograph of Rev. Alfred E. Eaton. It is provided by P. Barnard.
The Eatonia newsletter is named after Rev. Alfred E. Eaton who studied mayflies in England in the late 1800’s and is considered the “father” of the modern classification of mayflies.