The shape of the pelvis is thought to be a compromise between two opposing evolutionary pressures.
How has natural selection shaped koala bears?
This gives the Koala secondary grip on branches. Koalas sit in the folk of trees all day using their thick padded toes. This adaptation is more behavioral.
To cope with such a dietnature has equipped koalas with specialised adaptations. Koalas have a very slow metabolic rate, this allows the koala to retain food within their digestive system for a long period of time. This slow metabolic rate minimises the Koalas energy requirements. The koala has a special fiber-digesting organ called a caecum.
Other animals such as humans also have a caecum but the Koala is very long about cm long. The caecum contains millions of bacteria which breaks down fiber into substances which are easier to absorb.
Water is also absorbed from the gum leaves so that koalas rarely need to drink. How does a population adapt through natural selection? In any given population, there is always a struggle for survival, e. Organisms that have behaviors that encourage reproduction would be more likely to reproduce.
There is scientific evidence that all animals have evolved through natural selection. What is evolution through natural selection? Yes, penguins, like all animals, have gone through natural selection. Scientific evidence supports this notion.
Why behavior must have a genetic component to be favored by natural selection? One of the conditions of natural selection is that variant organisms are selected on their superior adaption to the environment, reproductive success and their passing on of t…hese traits to progeny, as populations evolve.
A genetic component is the physical molecule that is inherited by progeny which reflects their parents successful trait. This is the hard inheritable component of behavior. Can an innate behavior evolve via natural selection? Of course innate traits evolve via natural selection, in spite of what some in the humanities and social sciences think.
Behaviors are more complex and can depend on completel…y random events and the immediate environment. An old Woody Allen anecdote serves as example. Humor is a trait that can develop into behavior that advances reproductive success. He remarked that among the Apaches, who have little use for humor so he saidhe would have dine very poorly with the ladies.
So, whatever traits he had introversion, perhaps? Many things are more crude, such as neurotransmitters.
The amount of receptors for the neurotransmitter dopamine varies from human to human and is under the control of genes, which makes it heritable and subject to natural selection and thus evolves.
A person with very few of these receptors can seek quite risky behaviors to increase the amount of free dopamine in the cerebral fluid so to receive enough dopamine to feel the heightening effects, This expression is very complex though, depending on context, expressivity and immediate environment.
Another Answer While natural selection is the process of breeding to produce superior traits in an individual, the process of developing innate characteristics is a fundamental precept in discipline. The selection process does not play a part in this development.
At the writer above points out, humor is a trait. However, what is "funny" varies from culture to culture and is not a function of the natural selection process. Rather it is a cultural addition which is highly individualistic within each tribe. It is not a survival characteristic within a species.
Such concepts as "loyalty", "honor", "trustworthiness", or "charming" have tribal connotations and are developed according to cultural norms, not natural selection. This is proven when a member transfers from one cultural milieu to another, using the individual desired behaviors to successfully integrate into that tribe.
The cultural characteristic can be cultivated in order to smooth relations within a tribe. One such characteristic is "manners", which is the tribal way of interaction between members and varies according to the culture. It is not a survival trait, but a learned discipline.
The rules of manners can be as varied as each individual.Natural selection can take many forms. To make talking about this easier, we will consider the distribution of traits across a population in graphical form.
In we see the normal bell curve of trait distribution. For example, if we were talking about height as a trait, we would see that without any. Natural selection shaped the rise and fall of passenger pigeon genomic diversity.
However, in large populations, natural selection may be particularly important in shaping genetic diversity: Population genetic theory predicts that selection will be more effective in large populations.
Natural selection is unable to provide us with perfect protection against all pathogens, because they tend to evolve much faster than humans do. E.
coli, for example, with its rapid rates of reproduction, has as much opportunity for mutation and selection in one day as humanity gets in a millennium. 29 years of natural selection has shaped me into the best biology teacher on this planet. Basically if a behavior is found in wild animals of any kind, there is every reason to believe that it has been shaped by natural selection.
For humans this means that many of the elaborate cultural efforts we make may have a root in pre-cultural natural selection. Speakers at the conference, "The Evolution of Human Aggression: Lessons for Today's Conflicts," intend to explore how the long process of human evolution has shaped the various ways we display.