the driving forces behind evolution are Mutation, Natural Selection, Gene flow, and Genetic drift
So lets start with Natural selection, all this means is that that individuals best suited for their environment are more likely to survive and reproduce. That's all it is, Individuals with certain inherited traits leave more off spring than others.
an example of natural selection would be anti-biotic resistance in bacteria.
Now mutations, Mutations are random and can be beneficial, neutral, or harmful to an organism, however not all mutations matter in evolution. only those that can be passed on to the next generation matter. Those that occur in somatic cells do not matter to evolution.
Genetic drift - change in the gene pool of a small population due to chance. an example. Disasters such as the BP oil spill occur which kills off a large number of individuals, this results in a drastic reduction of the population size which in turn affects the genetic variation.
and finally Gene flow which is when individuals migrate between populations, this brings in more genetic variation.
Yes, evolution occurs on a genetic level through changes in the frequency of genetic variations over successive generations. These genetic variations can lead to changes in an organism's traits that can be passed on to offspring, driving evolution.
Three basic components of today's theory of evolution are genetic variation within a population, natural selection acting on this variation, and the inheritance of traits that confer a survival or reproductive advantage.
>The structural and well-organised gradual process of change means 'biological evolution'. >Variation and heridity are two basic factors of evolution. >In long term.evolution leads to existence of new species which have different characteristics than their ancestors.
abiogenesis, the theory that life arose from non-living matter, is fundamental to the concept of.
Answer 1Because they accept the myriad of evidence that underlines the Theory of Evolution by Natural Selection.Answer 2Because they relied on evidences, observations, experiments. These are the basic premises of sciences. For an idea to be called a 'theory' in science required more evidences and tests, etc. A theory in science means more than what most lay people realize. A hypothesis in science is closer to what lay people think of as a 'theory' in daily usage. So when you hear the Theory of Evolution, there is substantial evidence behind it, just like there is for the Theory of Relativity or Theory of Gravitation.On the other hand, just because something has lots of evidence behind it does not mean it's correct. However, it takes a lot of counter-evidence to overturn a theory. Remember, it took a long time and substantial evidence to change the theory that the earth was not the center of the universe.
Yes, evolution occurs on a genetic level through changes in the frequency of genetic variations over successive generations. These genetic variations can lead to changes in an organism's traits that can be passed on to offspring, driving evolution.
Gene
The theory of evolution is quite simple. The principle behind it states that every living being on Earth today came from a species that is now extinct. Over millions of years, each species has undergone evolution and has changed them to make them able to live in today's world. For example, humans evolved from a gibbon species and birds evolved from dinosaurs.
convection currents in the mantle provide the basic driving forces for plate motions.
convection currents in the mantle provide the basic driving forces for plate motions.
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