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Evolution
The scientific theory according to which populations change gradually through a process of natural selection.
5,264 Questions
Why is mutation important to spectation?
Without mutation there can be no evolution. Without evolution there can be no speciation.
When was The Neutral Theory of Molecular Evolution created?
The Neutral Theory of Molecular Evolution was created in 1983.
What is the next stage of human evolution called?
The next stage of human evolution is called homo sapiens sapiens.
More accurately, evolution has no "stages". Species names are merely labels attached to a particular morphotype - and since morphologies are continuously changing, must be considered arbitrary. Although the force of natural selection is greatly reduced in the human species, we are still evolving. However, predicting what direction our evolution will take requires the consideration of so many factors that it can't really be done.
When was The Major Transitions in Evolution created?
The Major Transitions in Evolution was created in 1995.
How evolutionists determine if two organisms share a common ancestor?
Evolutionists determine that two organisms have a common ancestor is by looking at fossil evidence in different rock layers using the law of Superposition (Oldest layers are on the bottom, newest are on the top) and compare the skulls or other bones to each other in order of oldest to newest (or newest to oldest). Another way to determine this is to examine the amount of DNA a certain species shares with another species. An example of this would be that Humans share roughly 90% of our DNA with chimpanzees or the other Great Apes.
Snow Leopards are an example of changes in coat thickness, coat color, tail length and fat storage which are adaptations to an alpine environment. Whether the progenitors of the Snow Leopard were isolated from the main population during glaciation, marginalized individuals that migrated where they could fill an unoccupied niche, out competed the previous niche holder or some combination
of these possibilities the result is the Snow Leopard.
What must true for two organisms to be considered the same species?
they can produce fertile offspring
Which statements about microevolution and macroevolution is true?
microevolution can lead to macroevolution
Which of the following ideas would follow from the dobzhansky-Mayr theory of speciation?
Isolated populations evolve differences gradually as they adapt to the environment
Does an animal's environment affect or does it not affect its adaptation?
This is the fundamental premise of the Theory of Evolution by Natural Selection; the environment has a fundamental impact on the adaptations and evolution of organisms. The environment "selects" for those specimens that survive to have more offspring. Those animals that cannot survive are selected against.
What kind of Americans opposed Darwins theory of evolution and why did they do so?
We often debate the way a baseball should be thrown or that someone wrote in an article that the way to hold a gun when shooting is THIS way not THAT way.
The people who oppose the idea of evolution are those who take the Christian bible literally.
Creationism is a religious belief. It says that all life began all at once just a few thousand years ago and has not changed.
Evolution says no to that view point. The universe is billions of years old and that things changed slowly over time and organisms adapt to survive in those changing environments.
These two will never agree and creationism should be seen in a religious light.
Why natural selection acts on the phenotype rather than genotype?
natural selection is a passive prosess . the mechanism of some individuals to be selected more than others is because they fit their environment more. and phenotype shows the fitness .
What is Kimuras Neutral Theory of Molecular Evolution?
Kimura (1968) • The vast majority of evolutionary changes at the molecular level are caused by random drift of selectively neutral mutants (not affecting fitness) ! The Molecular Clock.
What is the age of fossils that can be measured by what dating?
Fossils themselves can very rarely be dated by any means...their age is usually judged by the geological assessment of the area and layer in which they are found
What do biologists base their in belief in evolutionary theory?
It is the only theory presented that explains the existence of different species and the different versions/implementations within a species. It is based on various scientific based studies made over time by accepted scientists. All other beliefs are based on religious beliefs, mythology, superstition or suggestions of alien intervention.
Although the evolutionary theories have flaws (many flaws) and contradictory evidence, no other scientific based alternatives have been presented with enough evidence to warrant being accepted and until that occurs, the currently accepted beliefs will prevail, as will the religious beliefs, mythology, superstition and suggestions of alien intervention.
the sharing of common ancestors within the species' evolutionary history.
What caused a change in color of the majority of London gypsy moths?
They evolved in response to changing selection pressures (specifically predation by birds) as levels of pollution changed. The pollution reduced the effectiveness of the moths natural camouflage, resulting in the more visible moths being eaten by birds in large quantities, the less visible moths then were the only ones reproducing and their color became dominate in the population.
How did Charles Darwin develop his theory of evolution?
Charles Darwin was not qualified to make such theory, he was a naturalist and as such had a bias against the involvement of supernatural forces thus rendering his conclusions scientifically invalid. His education consisted of parts of the subjects of medicine, taxidermy, plant taxonomy, theology, geology, and few other things that related to the nature of his claims. his assumptions were based off observations he witnessed on the Galapagos Islands and influenced by a book he read on the voyage to the islands. The book stated that a river had carved away at a landscape to form a valley, Darwin believed that other things in the world were formed this way when he saw that there were finches on the islands he saw that they were different from the ones he had known at his home, he also observed that they changed from island to island. The conclusion he drew from this is that these birds must have shared a common ancestor and over time became similar creatures. His reasoning was influenced by the book because he believed that time was "carving" certain creatures into different ones through "evolution" he decided that if finches evolved this was then why not all creatures? The fundamental flaw in his conclusion is that he didn't have the instruments of the modern world and thus couldn't come to the reality that the finches were adaptations of the same creature, because they had lived on the Galapagos islands for a long time they "adapted" to life on the islands instead of the mainland. Darwin himself said "if science should prove me wrong than i am wrong" unfortunately evolution's claims violate several laws of physics, however many people refuse to accept this truth because they simply wish to remove God from life. Darwin studied theology and was actually trained to be a pastor he stated that in no way was his theory meant to usurp the supernatural authority of God, how he was trained to be a pastor AND a naturalist i really don't know.
How does environmental pressure affect natural selection?
When nothing happens to exert strong population pressure on that population, natural selection favors the allele frequency already present. When mutations cause new traits, natural selection weeds these traits out because they're not as efficient as the others.
Answer this question…
They probably have a recent common ancestor.
