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Answer 1
Two broad processes that make evolution possible are 1 : directional forces including mutation , migration and selection and 2: nondirectional forces that include random genetic drift , bottleneck effect , founders effect ,and chance variations .
Answer 2
Evolution is most commonly described as a combination of reproductive variation and differential reproductive success.
Reproductive variation in itself is a "non-directional" phenomenon, that produces mostly random variations. Differential reproductive success (or: natural selection) is a "directional" phenomenon, that basically acts as a mechanism limiting the set of "directions" produced by random variation.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoMutation(variation in allele frequencies) and natural selection.
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What are three reasons for natural selection to occur?
1. different breeding 2. evolution 3.adaptation
What were the 4 important things that Charles Darwin said?
1. Evolution did occur. 2. The evolutionary changes were gradual, taking from thousands of years to millions of years. 3. The primary mechanism for evolution was natural selection. 4. The millions of species existing today branched out from a single organism through a process called speciation. 1. Evolution did occur. 2. The evolutionary changes were gradual, taking from thousands of years to millions of years. 3. The primary mechanism for evolution was natural selection. 4. The millions of species existing today branched out from a single organism through a process called speciation.
What are the four steps of Darwin's theory of evolution?
The four steps of natural selection are- Overproduction- Variation- inherited Variations- Natural Selection
How is theory of evolution of Darwin and Hugo deVries different?
Darwin considered evolution to be caused due to : 1)small changes/variations that occured 2)these variations were directed specifically towards adapting to the environment(directional) 3)evolution was a slow process De Vries believed that evolution occured by: 1)large changes that occured 2)these changes were mutations and were stochastic or random, not directional 3)evolution occured in fits and starts and was not a slow ongoing process
How is mutation and natural selection similar?
Both establish that: 1. There are limited reproductive opportunities 2. Only those organisms with "favorable" traits will be allowed to reproduce and pass the traits onto their offspring The difference is that artificial selection involves human intervention
What 2 substances are necessary for combustion to occur?
The answer is: a fuel and an oxidant.
What were 2 things fundamentalists objected to do?
alcohol and the theory of evolution
What are the four ways evolution?
These four factors can effect ways evolution occur: 1.) Mutation 2.) Selection3.) Gene Flow4.) Genetic Drift
What are three reasons for natural selection to occur?
1. different breeding 2. evolution 3.adaptation
Cell division provides new cells so that what 2 things can occur?
growth and repair can occur
What four factors can cause evolution to occur?
1.) Mutation 2.) Selection 3.) Gene Flow 4.) Genetic Drift
What 2 things need to occur for work to happen?
A force has to to be exerted for a distance
What are the 2 things which are necessary for echo to form?
A noise and something for it to bounce off of
What 2 things must occur for work to be done?
Transfer of energy and something else.
What are the 2 things occur when potential energy has been converted into kinetic?
Movement and heat production .
When is Dragonball Evolution coming out?
There won't actually be a dragonball evolution 2.
What 2 things must increase for metamorphism to occur?
For metamorphism of rock to occur temperature and pressure must increase. Rocks created in this manner are called metamorphic rocks.
