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Question
Submitted by bukysu on Thu, 2013-05-23 10:43
due on Mon, 2013-05-27 10:42
answered 2 time(s)
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Biology

BIOLOGY

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1. Geneticists compare DNA base sequences among organisms and from this data determine a gene’s rate of evolution. Different genes have been found to evolve at different rates. 

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- Explain why some genes might have faster rates of evolution than other genes as populations adapt to their environments, and give an example with your explanation.

 

 

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2.Species have been traditionally characterized as “primitive” and “advanced.” For example, mosses were considered to be primitive, and flowering plants advanced; crocodiles were primitive and mammals were advanced. Most biologists of today think it is incorrect to characterize any modern species as primitive.

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Determine whether or not you believe it is incorrect to refer to any modern species as primitive, and explain why.

Answer
Submitted by kim woods on Thu, 2013-05-23 14:49
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BIOLOGY

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xxxxxxxxx xxx xxxxxxxxx xx fossils and other xxxxxxx xx xxx xxxxxx xxxxx xxxxx has been a growing interest in the xxxxxxxxx xx xxxxxx xxxxxxxx xxxxxxx DNA xxxx xxxxxxxxx among xxxxxxxxx and xxxx xxx xxxxxxxxxxx xxxx xxxxxxx determine x xxxx’s rate of evolution (Prakash, xxxxxx Genes xxxxx to a set of xxxxxxxxxxxx capable xx xxxxxxxxxxx xxxx organisms xxx like, their appearance, how xxxx xxxxxx in xxxxx xxxxx xxxxxxxxxxx as xxxx xx xxx they xxxxxxxxx survive xxxxxxx xxxxxx All living creatures have xxxxx xxx different xxxxx xxxx been xxxxx to evolve at xxxxxxxxx xxxxxx xx has also been discovered xxxx xxxx xxxxx xxxx xx xxxx faster xxxxx xx evolution xxxx other genes as xxxxxxxxxxx adapt xx their xxxxxxxxxxxx

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xxx rate at xxxxx xxxxx xxxxxx xx xxxxxxxxx upon the life span of xx xxxxxxxx xx xxxxxxx under examination xxxxxxxx 1999).

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Biology xx xxx PAGE \* MERGEFORMAT xxxxxxxxx

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xxxxxxxxxxx xxxxxxx DNA xxxx xxxxxxxxx among xxxxxxxxx xxx xxxx xxxx xxxx determine x xxxx’x xxxx of xxxxxxxxxx Different xxxxx have xxxx xxxxx xx evolve xx xxxxxxxxx xxxxxx ·

xxxxxxxxx the discovery xx xxxxxxx and other xxxxxxx xx the recent past, there xxx been x xxxxxxx interest in xxx evolution xx xxxxxx Genetics compare DNA base xxxxxxxxx among xxxxxxxxx xxx from xxx xxxxxxxxxxx xxxx xxxxxxx xxxxxxxxx a gene’s xxxx xx evolution. xxxxx xxxxx xx x set xx xxxxxxxxxxxx capable xx xxxxxxxxxxx xxxx organisms are like, their xxxxxxxxxxx xxx they behave xx their xxxxx xxxxxxxxxxx xx well xx xxx xxxx generally xxxxxxx xxxxxxx 2002). All xxxxxx xxxxxxxxx xxxx xxxxx and xxxxxxxxx genes have xxxx xxxxx to xxxxxx xx xxxxxxxxx rates. It has xxxx been xxxxxxxxxx xxxx xxxx genes tend xx have xxxxxx rates of

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Answer
Submitted by Diamondheart on Thu, 2013-05-23 11:52
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Biology

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xx xxxxx xxx two competing hypotheses xxxxxxxx xx xxxxxxx xxx rate of xxxxxxxxxxxx change. One xx called the xxxxxxxxxx equilibrium hypotheses. xxxx xxxxxxxxxx xxxxxx that there xxx periods xx xxxx in xxxxx the rate xx xxxxxxxxxxxx change xx xxxxx xxxxx xxxxxxx xxx interspersed xxxx periods of rapid xxxxxxx Rapid change xxxxxxx prevails with xxx early establishment of x xxxxxxxx xxxxxx xxxxx time xxx organism has xxx xxx xxxxxxxxxxx environmental adaptation. xxx xxxxxxxx if x food xxxxxx xxxxxxxxxx xxxxxxx unavailable to x particular xxxxxxxx xxx rate xx evolutionary change xxxx xxxxxxxx xxxxxxxx xx this way, xxx xxxxxxxxxxxxxxx xxxx xxxxxx so that xxx xxxxxxx can utilize a xxxxxxxxx xxxx source or the xxxxxxx will become extinct. xxxx this xxxxx xx common xxxxxx xxx species, the rate xx xxxxxxxxxxxx xxxxxx xxxx xxxx xxxxx An xxxxxxx xx punctuate xxxxxxxxxxx occurred xxxxxxxx xx xxxxx ago when aquatics species inhabited the emerging xxxx spaces. These species xxxxxxx developed

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