scholarly journals SYSTEMS OF MATING. II. THE EFFECTS OF INBREEDING ON THE GENETIC COMPOSITION OF A POPULATION

Genetics ◽  
1921 ◽  
Vol 6 (2) ◽  
pp. 124-143 ◽  
Author(s):  
Sewall Wright
Keyword(s):  
Genetic Composition

Computers and Iatrocomplexities

1966 ◽  
Vol 05 (04) ◽  
pp. 167-171 ◽  
Author(s):  
L. E. Faer
Keyword(s):  
Twentieth Century ◽  
Cigarette Smoke ◽  
Environmental Pollutants ◽  
Genetic Composition ◽  
Koch’S Postulates ◽  
Lung Malignancies ◽  
Causative Agents ◽  
Disease Study ◽  
Multiple Etiology ◽  
Great Advance

Developments of disease hypotheses and conceptions of disease as philosophic entities have shown bursts of great advance. One just concluded includes emergence of bacteriology and virology culminating in Koch’s Postulates, which in the twentieth century were primary bases for disease study and colored all approaches to medicine.With recent extraordinary advances in technology, medicine faces great new obligations demanding fresh approaches and untrammeled thinking for solution of problems posed. It is clear that any approach to diseases and disabilities induced by exposures to environmental pollutants must take multiple etiology into account. For example, contributing to causation of lung malignancies one must list usual dusts, radioactivity, smog, auto exhausts, cigarette smoke and genetic composition. Consideration of plural factors in genesis of environmentally associated disease leads to the hypothesis of the incremental insult, a complex and difficult conception in which must be included provision for multiple causative agents, each contributing but a fraction toward total etiology^ Computers developed to their present refinement provide necessary tools for whatever complexity required to spawn and fructify hypotheses of inter-relating associations of incremental insults leading to pathology.

Genetic Composition and Its Transmissibility Analysis of Wheat Candidate Backbone Parent Kenong 9204

2015 ◽  
Vol 41 (4) ◽  
pp. 574 ◽  
Author(s):  
Chun-Hua ZHAO ◽  
Xiao-Li FAN ◽  
Wei-Lian WANG ◽  
Wei ZHANG ◽  
Jie HAN ◽  
...  
Keyword(s):  
Genetic Composition

Genetic diversity of native cultivated cacao accessions (Theobroma cacao L.) in Nicaragua

2012 ◽  
Vol 10 (3) ◽  
pp. 254-257
Author(s):  
Erwin Aragon ◽  
Claudia Rivera ◽  
Helena Korpelainen ◽  
Aldo Rojas ◽  
Paula Elomaa ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Theobroma Cacao ◽  
Phytophthora Palmivora ◽  
Genetic Composition ◽  
Breeding Programmes ◽  
Black Pod ◽  
Black Pod Disease ◽  
Parental Lines ◽  
Resistant Genotypes ◽  
Theobroma Cacao L

A total of 60 farmers' cacao accessions (Theobroma cacao L.) from Nicaragua were investigated using microsatellite markers to reveal their genetic composition and to identify potentially resistant genotypes against the black pod disease caused by Phytophthora palmivora. These accessions were compared with 21 breeders' accessions maintained locally, two Criollo accessions from Costa Rica and two accessions from Ecuador. The analyses showed a low level of differentiation among groups of farmers' accessions (FST = 0.06) and that six Nicaraguan accessions were genetically closely related to the two Criollo accessions used as a reference. In addition, seven distinct genotypes were found to have allelic composition that may indicate linkage to resistance alleles, thus being potential parental lines in future breeding programmes.

scholarly journals Genetic composition of interspecific potato somatic hybrids and autofused 4x plants evaluated by DArT and cytoplasmic DNA markers

2016 ◽  
Vol 35 (6) ◽  
pp. 1345-1358 ◽  
Author(s):  
Paulina Smyda-Dajmund ◽  
Jadwiga Śliwka ◽  
Iwona Wasilewicz-Flis ◽  
Henryka Jakuczun ◽  
Ewa Zimnoch-Guzowska
Keyword(s):  
Dna Markers ◽  
Somatic Hybrids ◽  
Genetic Composition ◽  
Cytoplasmic Dna

scholarly journals Germplasm Conservation: Instrumental in Agricultural Biodiversity—A Review

2021 ◽  
Vol 13 (12) ◽  
pp. 6743
Author(s):  
Veerala Priyanka ◽  
Rahul Kumar ◽  
Inderpreet Dhaliwal ◽  
Prashant Kaushik
Keyword(s):  
Plant Species ◽  
Agricultural Production ◽  
Genetic Instability ◽  
Slow Growth ◽  
Germplasm Conservation ◽  
Agricultural Biodiversity ◽  
Genetic Composition ◽  
In Vitro Techniques ◽  
Protection Strategies

Germplasm is a valuable natural resource that provides knowledge about the genetic composition of a species and is crucial for conserving plant diversity. Germplasm protection strategies not only involve rescuing plant species threatened with extinction, but also help preserve all essential plants, on which rests the survival of all organisms. The successful use of genetic resources necessitates their diligent collection, storage, analysis, documentation, and exchange. Slow growth cultures, cryopreservation, pollen and DNA banks, botanical gardens, genetic reserves, and farmers’ fields are a few germplasm conservation techniques being employed. However, the adoption of in-vitro techniques with any chance of genetic instability could lead to the destruction of the entire substance, but the improved understanding of basic regeneration biology would, in turn, undoubtedly increase the capacity to regenerate new plants, thus expanding selection possibilities. Germplasm conservation seeks to conserve endangered and vulnerable plant species worldwide for future proliferation and development; it is also the bedrock of agricultural production.

scholarly journals 98 Impact of social mixing on feedlot steer eating and lying behavior

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 63-64
Author(s):  
Amanda J Hubbard ◽  
Jason Sawyer ◽  
Reinaldo F Cooke ◽  
Jenny Jennings ◽  
Courtney L Daigle
Keyword(s):  
Body Weight ◽  
Genetic Composition ◽  
Feedlot Steers ◽  
Social Mixing ◽  
Tactile Contact ◽  
Mixing Proportion ◽  
The Impact ◽  
Over Time

Abstract This study evaluated the impact of mixing cattle from two sources of feedlot steers (n = 96) on feeding and lying behavior. Angus crossbred steers (n = 48 McG and n = 48 BCS), similar in genetic composition, were transported (833.64 ± 85.29 km) to a feedlot 39-d prior to mixing where the two sources were housed without visual or tactile contact. Steers, blocked by source and stratified by d -34 body weight, were randomly assigned to one of 12 pens (n = 8 steers/pen) for the 42-d study. Pens were assigned to one of two treatments (n = 6 pens/treatment): 1) NOMIX—100% of cattle from McG (n = 3 pens) or BCS (n = 3 pens) and, 2) MIX—50% of cattle from BCS and 50% from McG (n = 6 pens). Instantaneous scan sampling (n = 61 scans/d; 10 min intervals) recorded the number of steers per pen eating and lying on d1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 21, 22, 23, 28, 29, 36, and 37 after mixing. Proportion of steers lying varied across time (P < 0.0001); however, a greater proportion of steers laid down on d1 compared to d7, 8, 9, 16, and 28 (P < 0.03). The proportion of steers observed eating increased over time (P < 0.0001). Fewer steers ate on d1 than d9, 14, 15, 28, 29, and 36 (all P < 0.01). More steers were observed eating on d8 and 16 than the first seven days (all P < 0.01) and on d37 than the first 6 days (all P < 0.02). While there was no impact of mixing, data indicate that handling and sorting cattle into new pens impacts eating and lying behavior and it takes approximately a week for behavior to stabilize.

scholarly journals 99 Impact of social mixing on feedlot steer eating and lying behavior

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 17-18
Author(s):  
Amanda J Hubbard ◽  
Jason Sawyer ◽  
Reinaldo F Cooke ◽  
Jenny Jennings ◽  
Courtney L Daigle
Keyword(s):  
Body Weight ◽  
Genetic Composition ◽  
Feedlot Steers ◽  
Social Mixing ◽  
Tactile Contact ◽  
Mixing Proportion ◽  
The Impact ◽  
Over Time

Abstract This study evaluated the impact of mixing cattle from two sources of feedlot steers (n = 96) on feeding and lying behavior. Angus crossbred steers (n = 48 McG and n = 48 BCS), similar in genetic composition, were transported (833.64 ± 85.29 km) to a feedlot 39-d prior to mixing where the two sources were housed without visual or tactile contact. Steers, blocked by source and stratified by d -34 body weight, were randomly assigned to one of 12 pens (n = 8 steers/pen) for the 42-d study. Pens were assigned to one of two treatments (n = 6 pens/treatment): 1) NOMIX—100% of cattle from McG (n = 3 pens) or BCS (n = 3 pens) and, 2) MIX—50% of cattle from BCS and 50% from McG (n = 6 pens). Instantaneous scan sampling (n = 61 scans/d; 10 min intervals) recorded the number of steers per pen eating and lying on d1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 21, 22, 23, 28, 29, 36, and 37 after mixing. Proportion of steers lying varied across time (P < 0.0001); however, a greater proportion of steers laid down on d1 compared to d7, 8, 9, 16, and 28 (P < 0.03). The proportion of steers observed eating increased over time (P < 0.0001). Fewer steers ate on d1 than d9, 14, 15, 28, 29, and 36 (all P < 0.01). More steers were observed eating on d8 and 16 than the first seven days (all P < 0.01) and on d37 than the first 6 days (all P < 0.02). While there was no impact of mixing, data indicate that handling and sorting cattle into new pens impacts eating and lying behavior and it takes approximately a week for behavior to stabilize.

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