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Category: Best Dog Food Pitbulls | Author: admin 18.07.2015
Currently species are still primarily distinguished by their appearance, but it is becoming very clear that looks don't always tell us all we need to know about whether two organisms are different. However, two famous scientists stand out in terms of how we perceive species differences today: Carl Linnaeus, an 18th-century Swedish naturalist, and Charles Darwin. Many so-called cryptic species exist that, to the untrained eye, look very similar or even identical to another organism--commonly found, for example, in nocturnal mammals such as bats and bush babies.
Such a bar code can then be used to identify organisms which may not be easily identified (such as tracing back what primate was the source of mysterious smoked meat in the rainforest) and even to distinguish organisms such as microbes that we cannot see or culture in the laboratory. It is certainly curious how domestic dogs, which we know--because DNA bar coding has told us!--were raised by man from a wild gray wolf (Canis lupus) ancestor, can take on such a dramatic variety of forms.

There has been much debate among scientists about which DNA sequence is best for this purpose, and it is likely that a different sequence will work for each different kingdom of organisms.
But among dogs, which are well known for their hybrid (or mongrel) varieties, different breeds can mate and have viable offspring, so they are all found under the umbrella of a single species, Canis familiaris. So humans can accelerate the process of selection dramatically by exploiting the diversity naturally found in domestic forms and homing in on a form that is desirable. Darwin was among the first people, and certainly the most celebrated among them, to develop a credible theory on how species evolve (via natural selection). Because of these red herrings--and also because the process of describing species is very long and labor-intensive--scientists are increasingly turning to DNA to assist them in identifying and describing species.

Both of these scientists' insights underpin most of what modern science utilizes when studying species and speciation.

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Comments »

  1. Clears up myths, emphasizes real looking expectations.

    | surac — 18.07.2015 at 13:53:58

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    | Henry — 18.07.2015 at 17:38:33

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    | SONIC — 18.07.2015 at 19:56:11