A concept in evolution linking survival of the fittest to natural selection. Traits or behavior benefiting the survival of an organism or species will thrive by having an advantage in being passed on to future generations. Charles Darwin, the father of modern evolutionary theory In the life sciences, evolution is a change in the traits of living organisms over generations, including the emergence of new species. ... Herbert Spencer coined the phrase survival of the fittest Survival of the fittest is a phrase which is a shorthand for a concept relating to competition for survival or predominance. ... Natural selection is the primary mechanism within the scientific theory of evolution, in that it alters the frequency of alleles within a population. ...
The following situations are examples of survival value in action:
Primate A is afraid of snakes. Primate B is afraid of armadillos. Primate A has a better chance of living longer and is therefore more likely to produce offspring and pass on his or her phobia.
Members of animal pack A develop a ritual that ensures only the strongest individuals mate. Members of animal pack B reproduce randomly. Pack A will become more resilient and more likely to survive the elements, thus passing on their ritual.
Tree A produces seeds wrapped in a nutritious filling. Tree B does not. Hungry animals will give tree A an advantage in producing more offspring over a broader area.
In the examples above the behavior or trait in the A group has a higher survival value than group B. This is partially why more people are afraid of snakes than armadillos, male rams headbutt each other for mating rights, and peach trees grow more than just the pits.
Survival value can explain a range of behavior, from many animals' compulsion to run away to die (to save others from infection) to the Coolidge effect to the maternal instinct. In biology, the term Coolidge effect describes the re-arousal of a male animal by the introduction of a new female. ...
However, evolutionary principles are more intricate than such a general rule; survival value cannot explain everything throughout the history of evolution.
Genetic anomalies, such as albinism, occur despite having a low survival value.
Abnormal behavior and other disorders also persist despite having a low survival value -- although the concept of survival value may be stretched to explain them (for example, one could argue that serial killers are acting on a triggered evolutionary safeguard against overpopulation).
Technology has impacted what has survival value. For example, due to the advent of corrective lenses, 20/20 vision has a smaller survival value than it once did.
Complex emotional states are not easily explained by survival value. The survival value of the ability to feel pain, for example, is easily understood, but the concept of guilt is more complicated.
First, it is important to think of the survivalvalue of an act from a genetic perspective, not from a human one.
At issue is not whether there is survivalvalue in helping your genetically unrelated neighbor today, but rather whether helping members of the same clan or tribe would have had survivalvalue in the distant past, when there was typically a significant degree of genetic overlap between individuals in the same community.
By changing the chick's environment, it is possible to undermine the survivalvalue of instinctive behavior, but that does not mean that the behavior lacked survivalvalue at the time it evolved.
The term survival analysis is used predominately in biomedical sciences where the interest is in observing time to death either of patients or of laboratory animals.
There are certain aspects of survival analysis data, such as censoring and non-normality, that generate great difficulty when trying to analyze the data using traditional statistical models such as multiple linear regression.
From the graph we see that the survival function for each group of treat are not perfectly parallel but that they are separate except at the very beginning and at the very end of the study time.
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