Influence of selection pressures on enzyme polymorphisms in Drosophila

Nature ◽  
1975 ◽  
Vol 257 (5527) ◽  
pp. 590-592 ◽  
Author(s):  
B. D. H. LATTER
Keyword(s):  
Selection Pressures ◽  
Enzyme Polymorphisms

The bottleneck may be the solution, not the problem

2016 ◽  
Vol 39 ◽  
Author(s):  
Arnon Lotem ◽  
Oren Kolodny ◽  
Joseph Y. Halpern ◽  
Luca Onnis ◽  
Shimon Edelman
Keyword(s):  
Working Memory ◽  
Language Acquisition ◽  
Recent Theory ◽  
Cognitive Mechanisms ◽  
Selection Pressures ◽  
Biological Trait ◽  
Memory Bottleneck

AbstractAs a highly consequential biological trait, a memory “bottleneck” cannot escape selection pressures. It must therefore co-evolve with other cognitive mechanisms rather than act as an independent constraint. Recent theory and an implemented model of language acquisition suggest that a limit on working memory may evolve to help learning. Furthermore, it need not hamper the use of language for communication.

Chinese and American Individuals’ Mate Selection Pressures: Self-Focused vs. Mate-Focused

2017 ◽  
Vol 48 (1) ◽  
pp. 97-112 ◽  
Author(s):  
Ruoxi Chen ◽  
Fred P. Piercy ◽  
John K. Miller ◽  
Jason P. Austin
Keyword(s):  
Mate Selection ◽  
Selection Pressures

scholarly journals Genetic diversity and evolution of hepatitis C virus – 15 years on

2004 ◽  
Vol 85 (11) ◽  
pp. 3173-3188 ◽  
Author(s):  
Peter Simmonds
Keyword(s):  
Genetic Diversity ◽  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Human Liver ◽  
Large Population ◽  
Sequence Divergence ◽  
Selection Pressures ◽  
Host Interactions ◽  
Persistent Viruses ◽  
The Face

In the 15 years since the discovery of hepatitis C virus (HCV), much has been learned about its role as a major causative agent of human liver disease and its ability to persist in the face of host-cell defences and the immune system. This review describes what is known about the diversity of HCV, the current classification of HCV genotypes within the family Flaviviridae and how this genetic diversity contributes to its pathogenesis. On one hand, diversification of HCV has been constrained by its intimate adaptation to its host. Despite the >30 % nucleotide sequence divergence between genotypes, HCV variants nevertheless remain remarkably similar in their transmission dynamics, persistence and disease development. Nowhere is this more evident than in the evolutionary conservation of numerous evasion methods to counteract the cell's innate antiviral defence pathways; this series of highly complex virus–host interactions may represent key components in establishing its ‘ecological niche’ in the human liver. On the other hand, the mutability and large population size of HCV enables it to respond very rapidly to new selection pressures, manifested by immune-driven changes in T- and B-cell epitopes that are encountered on transmission between individuals with different antigen-recognition repertoires. If human immunodeficiency virus type 1 is a precedent, future therapies that target virus protease or polymerase enzymes may also select very rapidly for antiviral-resistant mutants. These contrasting aspects of conservatism and adaptability provide a fascinating paradigm in which to explore the complex selection pressures that underlie the evolution of HCV and other persistent viruses.

Enzyme polymorphisms influencing the metabolism of heterocyclic aromatic amines

2004 ◽  
Vol 802 (1) ◽  
pp. 175-181 ◽  
Author(s):  
Luisa Airoldi ◽  
Cinzia Magagnotti ◽  
Roberta Pastorelli ◽  
Roberto Fanelli
Keyword(s):  
Aromatic Amines ◽  
Heterocyclic Aromatic Amines ◽  
Enzyme Polymorphisms

scholarly journals Environmental Selection Pressures Related to Iron Utilization Are Involved in the Loss of the Flavodoxin Gene from the Plant Genome

2015 ◽  
Vol 7 (3) ◽  
pp. 750-767 ◽  
Author(s):  
Juan J. Pierella Karlusich ◽  
Romina D. Ceccoli ◽  
Martín Graña ◽  
Héctor Romero ◽  
Néstor Carrillo
Keyword(s):  
Plant Genome ◽  
Selection Pressures ◽  
Environmental Selection ◽  
Iron Utilization

scholarly journals Cooperation and the evolution of intelligence

2012 ◽  
Vol 279 (1740) ◽  
pp. 3027-3034 ◽  
Author(s):  
Luke McNally ◽  
Sam P. Brown ◽  
Andrew L. Jackson
Keyword(s):  
Decision Making ◽  
Social Interactions ◽  
Cognitive Abilities ◽  
Artificial Neural Network Model ◽  
Social Intelligence ◽  
Arms Race ◽  
Selection Pressures ◽  
Social Intelligence Hypothesis ◽  
The Social ◽  
Selection For

The high levels of intelligence seen in humans, other primates, certain cetaceans and birds remain a major puzzle for evolutionary biologists, anthropologists and psychologists. It has long been held that social interactions provide the selection pressures necessary for the evolution of advanced cognitive abilities (the ‘social intelligence hypothesis’), and in recent years decision-making in the context of cooperative social interactions has been conjectured to be of particular importance. Here we use an artificial neural network model to show that selection for efficient decision-making in cooperative dilemmas can give rise to selection pressures for greater cognitive abilities, and that intelligent strategies can themselves select for greater intelligence, leading to a Machiavellian arms race. Our results provide mechanistic support for the social intelligence hypothesis, highlight the potential importance of cooperative behaviour in the evolution of intelligence and may help us to explain the distribution of cooperation with intelligence across taxa.

Sign in / Sign up

Export Citation Format

Share Document