The central tenet of multilevel (or group) selection theory conveys that selection not only acts on individuals but can act (simultaneously) on multiple levels of biological organization , including cells and/or groups 48 .
What is an example of group selection?
Examples of behaviours that appear to influence group selection include cooperative hunting , such as among lions and other social carnivores; cooperative raising of young, such as in elephants; and systems of predatory warning, such as those used by prairie dogs and ground squirrels. ...
What is the group selection theory?
The basic idea of group selection theory is that the logic of natural selection acting at the level of individual organisms can also be applied to the level of whole groups of organisms . Exactly what this means and whether it is a useful way of thinking about the biological world remains very controversial.
What is group selection psychology?
Group selection is a proposed mechanism of evolution in which natural selection acts at the level of the group , instead of at the more conventional level of the individual. ... Williams, and Richard Dawkins argued that natural selection acted primarily at the level of the individual.
What is the difference between group and kin selection?
The intuitive idea is that kin selection occurs in populations that are structured such that relatives tend to interact differentially, whereas group selection occurs in populations in which there are stable, sharply bounded, and well-integrated social groups at the relevant grain of analysis.
How do you explain natural selection?
Natural selection is the process through which populations of living organisms adapt and change . Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.
What is an example of intersexual selection?
Intersexual selection occurs as a result of interactions between males and females of a species. One sex, typically males, will develop and display traits or behavior patterns to attract the opposite sex. Examples of such traits include plumage on birds, the mating calls of frogs, and courtship displays in fish .
Why is group selection controversial?
In the 1960s and 1970s, the group selection hypothesis was heavily critiqued by authors such as G.C. Williams, John Maynard Smith, and Richard Dawkins. They argued that group selection was an inherently weak evolutionary mechanism, and not needed to explain the data anyway .
What are the levels of selection?
Thus we have selection at three levels: genic, individual and intergroup all contributing to the maintenance of the t/T polymorphism. Would we expect to detect meiotic drive systems in natural populations?
What is an example of individual selection?
Cuttlefish are a fascinating example of individual selection leading to several different individual adaptations. In particular, the males participate in sperm competition for reproductive success. ... Initially, it appears that the larger males have the advantage when it comes to competing for access to females.
Does group selection exist?
Influential theorist George Williams acknowledged that although group selection might be possible, in real life “group-related adaptations do not, in fact, exist .” ... In the past few decades, however, group selection has made a quiet comeback among evolutionary theorists.
What does group selection require?
If trait-group selection is to play the role of a “genetic mechanism” in group selection theory, then it must be the case that, for instance, groups with more “group promoting” individuals (an aggregate trait) must be better organized and more harmonious (emergent traits) .
What is gene level selection?
In recent literature, ‘gene- level selection’ is often used in a restricted sense, to mean selection between genes within a single organism , as occurs in cases of intra-genomic conflict, e.g. meiotic drive. In this sense, most selection processes cannot be described as gene selection.
Does kin selection apply to humans?
The viscous population mechanism makes kin selection and social cooperation possible in the absence of kin recognition. ... In humans, altruism is both more likely and on a larger scale with kin than with unrelated individuals; for example, humans give presents according to how closely related they are to the recipient.
What do you mean by kin selection?
Kin selection, a type of natural selection that considers the role relatives play when evaluating the genetic fitness of a given individual . ... Kin selection occurs when an animal engages in self-sacrificial behaviour that benefits the genetic fitness of its relatives.
What is Hamilton’s rule?
Specifically, Hamilton’s rule states that the change in average trait value in a population is proportional to BR−C . This rule is commonly believed to be a natural law making important predictions in biology, and its influence has spread from evolutionary biology to other fields including the social sciences.
