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Evolution
The scientific theory according to which populations change gradually through a process of natural selection.
5,264 Questions
The trait, 'to live longer ', would only be selected for in individuals if it was reproductively successful. Then the alleles for living longer would be more frequently represented in the population of these animals.
The evolution of civilization has been directly affected by the development of tools and what?
materials
In xmen evolution what power does jubilee have?
Jubilee's power is to shoot fireworks out of her hands. hope this helped.
The proportion of the amino acids are similar to those produced in the Miller-Urey experiment.
Fitness in evolution means reproductive success. The fittest individuals are those which contribute the largest number of offspring to the next generation.
Speciation caused by change in the course of a river is an example pf divergent speciation?
Allopatric speciation.
No, they are random, This means that they occur in no set numerical order. So, though they can not be predicted it is certain, with the mistakes made in replication and other factors, that they will occur.
What was Charles Darwin's Theory of Evolution?
Charles Darwin's theory of natural selection applies to organisms who adapt to their environment better than others and survive to pass on their traits to offspring. Due to variation in their genes, may be caused by mutation but rarely so, organisms are able to adapt to their environment. If they don't adapt well they die. If they adapt to their environment it means that they have fought for their survival and are now able to pass on their variations to their offspring and make them stronger. Often as a result a new species is formed due to the accumulated differences.
There are three types of natural selection: Directional, disruptive, and stabilizing selection. In directional selection only one extreme genotype is favored to pass on. Meaning the environment chooses one genotype to pass on. An extreme genotype for example would be either SS or ss for sickle cell, either the genotype for sickle cell is passed on or the non-sickle cell genotype is passed on. In disruptive selection, a disruption separates similar organisms causing the favoring of two extreme genotypes. For example both SS and ss are favored to pass on. In stabilizing selection only the middle genotype is favored meaning Ss which is carrier of sickle cell.
Natural selection is when the environment determines which alleles enable organisms to survive.
The theory of natural selection states that traits in a species become more or less prevalent depending on environmental pressures that select either for or against such traits.
Individuals that have traits that better suit their environment are more likely to survive.
Darwin broke down the process into 4 steps:
1. individuals that make up a population vary in their traits
2. some of these trait differences are heritable
3. in each generation, many more offspring are produced than can survive. Only some individuals survive. Of these, some will produce more offspring than others
4. Individuals with certain heritable traits are more likely to survive and reproduce.
Natural Selection occurs when individuals with certain traits produce more offspring than do individuals with certain traits produce more offspring that do individuals without those traits.
when organism adapt to the environment they will be likely to survive and produce healthy offspring.
Humans have countered natural selection by medically correcting phenotypes?
Humans have countered natural selection through hybrid breeding. Even crossing a male donkey with a female horse produces a mule. Crossing certain corn strains with other corn strains to produce more grain per ear.
Will natural selection act on tongue rolling in a human population?
No because theres no selective advantage
Is human brain a living organism?
It would not be considered a living organism because it does not carry out several of the qualifications needed to be considered alive, including feeding and reproducing. It is, however, part of humans who are obviously considered living organisms and also consisting of cells, which are living organisms.
Why should mutation persist if it kills people?
Mutations are inherently random. The ones which kill people before they can reproduce do not persist, but if the mutation doens't lead to death until later in life, it may, if heritable, persist in later generations.
What two people disproved evolution?
The Darwinian model of evolution by natural selection has not been disproved.
What principles is not part of Darwin's original theory of evolution by natural selection?
Random processes are not part of the theory of evolution by natural selection.
How does natural selection affect variation?
Variation naturally occurs in populations as new traits arise from random mutations. However, through natural selection only those traits that are beneficial to the organism are passed on to the next generation. Any harmful mutations are naturally weeded out.
Which type of mutations contribute to evolution?
Mutation is one of the mechanism by which new alleles enter the population gene pool. Evolution is often defined as the changing of allele frequencies in population gene pools. A mutation could change the frequency of a particular allele from zero to non-zero.
Lack of genetic diversity can becomes a problem when a species is hit with infectious diseases. If all the organisms are very similar, then it is very likely that they will all be affected by the same disease, thus destroying the species as a whole. In species with high amounts of genetic diversity, a disease may destroy a section of the population, but many individuals will be resistant to the disease.
What made water a better nursery than land for the evolution of animals?
Water is better for life to thrive because there is adequate room and the water is always moving. This means that a species can distribute itself into the water and make colonies, instead of having to walk around on land.
What do anti-evolutionists creationists and intelligent design advocates really know of evolution?
From there pamphlets and " text " books it would seem very little is known by these people. The basics, such as evolution is a fact and the theory of evolution by natural selection explains much of this fact, seems to elude many of them. Look to the intelligent design people. Not one scintilla of positive evidence can they cite, yet they want their nonsense, not scientifically validated, to be taught in science class. A cheat and a end run around the scientific process.
How could the Theory of Evolution contribute to the rise in the popularity of Gothic literature?
The theory of evolution by natural selection explains how adaptive change may lead to speciation,\. As any good scientific theory it explains much but not everything. I seriously doubt, except in an ultimate sense, that you can explain why Gothic literature is now popular with evolutionary theory.
Cross this set of alleles. Aa X AA
The a is a deleterious genetic defect and in a small population the carriers of this defect will breed with each other in a probabilistically greater number.
Why do species rise from a small sample necessarily? They do not always do that. A geographically isolated species may be very large.
Regardless, look to the alleles I showed you. Probabilities are all. Say this cross in our small population.I showed these alleles existing.
Aa X Aa
This cross yields 1/4 AA, and probabilistically a small population could get out of deleterious trouble; or they could, after a time, go extinct. Lots of random events in the history of life.
