Digital Commons Network^™

Isolation And Characterization Of Autosomal Male Sterile Mutants In Drosophila Melanogaster, Lynn J. Romrell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In order to study the genetic control of spermiogenesis, recessive, male-sterile, autosomal mutants of Drosophila melanogaster were induced with ethyl methanesulfonate. A total of 31 mutants were recovered, 15 of which were located on the second chromosome and 16 on the third chromosome. Eight second- and 6 third-chromosome mutants demonstrating sterility in all homozygous males were used for further analysis.

Complementation tests showed that 2 of the 8 second chromosome mutants (and none of the 6 third chromosome mutants) were noncomplementing, indicating that two of the mutants produced were alleles of the same locus. Mapping of the second chromosome mutants …

The Effect Of Chromosomal Position On Dosage Compensation And Ontogenic Expression Of The V+ Gene In D. Melanogaster, Jack E. Tobler

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two manifestations of gene regulation-- dosage compensation and ontogenic regulation--were examined in normally positioned and relocated v⁺ genotypes in Drosophila melanogaster to determine the role of gene position in these control functions. Enzyme assays, used as criteria of gene activity, were performed on various genotypes containing different doses of v⁺ in normal and relocated positions in male and female flies. The results indicate that although differently positioned v⁺ genes may specify different tryptophan pyrrolase activities, they still show dosage compensation. In each case, the enzyme activity associated with each gene, either on the X, Y, or third …

Marine Resource Information Bulletin, Vol. 3, No. 7, Virginia Sea Grant, Virginia Institute Of Marine Science

Books

• VIMS scientists improve methods for producing "cultch-free" spat
• Foreign fishing off the U.S.
• Oyster meats quality index
• Certified crab meat plants in Virginia

Thank The Birds, A Beautiful Junket Pays Dividends, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

A Comparison Of The In Vitro Viability Of Ova From Hormone-Treated Mice With Ova From Spontaneous Ovulations, Henry H. Lyon

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Science and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Henry H. Lyon on April 23, 1971.

Variety Of Waterfowl Lured By Texas Refuge, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Dietary Fare Rather Limited By Bold Bird Of Prey S Elfin Size, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

A Conceptual Draft Of A Dynamic Hydro-Biological Model For Lake Mead, L. G. Everett, Bureau Of Reclamation

Publications (WR)

Food and energy transformation in an aquatic system must be understood in order to develop a simulation approach. This report provides a comprehensive study of an aquatic ecosystem. The objectives of this report are to show: (1) the biological relationships in an aquatic system (2) the role of nutrients in the biological cycle (3) the role of abiotic factors in a limnetic environment (4) the status of the art of "Eutrophication modeling".

Chorus Of Chachalacas Heard Along U.S. Border With Mexico, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

End Matter, Vol. 13 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 13 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 13 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 13 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Taxonomic Revision Of The Weevil Genus Tychius Germar In America North Of Mexico (Coleoptera: Curculionidae), Wayne E. Clark

Brigham Young University Science Bulletin, Biological Series

A study of morphological characters of 4,000 adult weevils used in preparing a key and descriptions indicates there are fifteen North American species in the genus Tychius Germar. Adults occur on plants in the genera Astragalus, Baptisia, Hedysarum, Lotus, Lupinus, and Oxytropis.

The genus is divided into two species groups. The T. sordidus group appears to have representatives in the Old World fauna, but the T. semisquamosus group is probably native to North America. New names, Tychius caesius, and T. hirsutus are proposed for T. armatus Green, 1920 (not Tournier, 1873), and T. hirtellus LeConte, 1876 (not Tournier, 1873) respectively. …

Notes On Eriogonum - Vi : A Revision Of The Eriogonum Microthecum Complex (Polygonaceae), James L. Reveal

Brigham Young University Science Bulletin, Biological Series

This revision discusses seven closely related species of Eriogonum (Polygonaceae) found in the western United States of North America. One of the two major species, E. microthecum, is composed of nine varieties which range over a wide area of the Far West. The other major species, E. effusum, is found over a more restrictive geographical range mainly east of the Continental Divide. The remaining five species are primarily restricted to the Colorado-Green river drainage basin of Utah, Colorado, New Mexico, and northern Arizona. Together these entities form the core of a group of plants known as Section Corymbosa. …

Front Matter, Vol. 13 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 13 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Taxonomic Study Of Crotaphytus Collaris Between The Rio Grande And Colorado Rivers, William Ingram Iii, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

Little work has been done previously on the taxonomy of Crotaphytus collaris baileyi. This and the demonstration by Fitch and Tanner that C. c. baileyi is a heterogeneous grouping prompted the present study. Only the populations of the type material, the Upper Colorado River Basin, and the Chihuahuan Desert were studied. Multivariate, variance, canonical and discriminant analyses of external characters were performed, and pattern-coloration characters were examined on living specimens.

The results of the analyses show significance between all three populations. The discriminant functions distinguished between the populations with 80% reliability and patternal characters were discriminatory with near 100% reliability. …

Marine Resource Information Bulletin, Vol. 3, No. 6, Virginia Sea Grant, Virginia Institute Of Marine Science

Books

• Field crews study herring spawning sites and nurseries
• Oyster meats quality index
• Certified crab meat plants in Maryland

Peace Reigns In Avian Home After Flightiness At Nest Site, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Type Appraisal: Ii. Variation In Type Traits Due To Sires, Herds, And Years, H. D. Norman, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Variance components were estimated from type appraisal data to determine the importance of year, herd, sire, and herd x sire effects upon 49 body, udder, and management traits. Estimates were based on over 16,000 appraisals on daughters of Holstein artificial insemination sires. The variation explained by these effects never exceeded 34% of the total variance. Year effects were almost nonexistent (-2 to 3%). Herd effects were small for all traits except feeding speed, body weight, intensity and persistency of edema, and ketosis, and never exceeded 25%.

Most appraisal traits had low heritabilities. The estimate for milking speed was .23 while …

Type Appraisal: I. Effects Of Age And Stage-Of-Lactation On Type Ratings, H. D. Norman

Department of Animal Science: Faculty Publications

Dairy cattle type appraisal data were examined to determine whether body and udder conformation and management ratings were affected by age and period of lactation at appraisal. Data were collected from 1961 to 1968 from 188 herds having over 23,000 Holstein type appraisals. The body and udder traits were scored by scheduled appraisers, and the management traits were coded by each dairyman. Some of the 35 original traits were composed of more than one descriptive characteristic and, as a result, 49 renamed traits were derived from these.

A model was selected that considered years and herds as well as cow …

Type Appraisal: Iii. Relationships Of First Lactation Production And Type Traits With Lifetime Performance, H. D. Norman, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Phenotypic and genetic correlations were estimated between 48 type appraisal traits and first lactation milk production to determine the importance of appraisal traits in a breeding program from 5,024 records from the New York type appraisal program. Most phenotypic correlations among the type traits were near zero. Depth of udder was the appraisal trait having the highest correlation with first lactation milk (.27) and fat (.23). Multiple correlations of all appraisal traits with first lactation milk and fat were .44 and .40.

Correlations with lifetime variables were calculated from 2,068 records meeting time qualifications. Of the first lactation variables, milk …

Seasonal Bird Activity Signals Spring Winging Toward North, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Study To Cover Nesting Habits Of Eagle, Fish Hawk, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Spotlight On Bald Eagle During Audubon Outing, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

End Matter, Vol. 13 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 13 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Revision Of Cryptantha Subgenus Oreocarya, Larry C. Higgins

Brigham Young University Science Bulletin, Biological Series

This study is a taxonomic revision of Cryptantha subgenus Oreocarya (Boraginaceae), together with descriptions of species, synonyms, distribution maps, and discussions. The present treatment recognizes fifty-seven species and fourteen varieties, all separated by means of a comprehensive key, A history of the group, along with a discussion of distribution, ecology, and phylogeny is presented. As a basis for the comparison of taxa much of the research has been concentrated on morphological variation in herbarium specimens. Particular attention has been directed to a study of pubescence types, branching patterns, flowers, calyces, and fruit. The herbarium research has been correlated with extensive …

Whole Issue Nebraska Bird Review (March 1971) 39(1)

Nebraska Bird Review

TABLE OF CONTENTS

Treasurer's Report ....................2

Pileated Woodpecker in Otoe County ....................3

1970 Christmas Count ....................4

Winter Meeting ....................9

1970 Nebraska Nesting Survey ....................10

Notes ....................15

In Memoriam ....................16