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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.

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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

Related Questions

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What are three things that can occur during a depression?

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