GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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all organisms undergo natural selection.
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all organisms may have descended from a common ancestor.
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selective breeding takes place every day.
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genetic resistance rarely occurs.
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Detailed explanation-1: -Like structural homologies, similarities between biological molecules can reflect shared evolutionary ancestry. At the most basic level, all living organisms share: The same genetic material (DNA) The same, or highly similar, genetic codes.
Detailed explanation-2: -All living organisms store genetic information using the same molecules-DNA and RNA. Written in the genetic code of these molecules is compelling evidence of the shared ancestry of all living things.
Detailed explanation-3: -Evidence of a common ancestor for all of life is reflected in the universality of DNA as the genetic material, in the near universality of the genetic code, and in the machinery of DNA replication and expression. In general, the relatedness of groups of organisms is reflected in the similarity of their DNA sequences.
Detailed explanation-4: -DNA is used as evidence for evolution because it shows that all species have one common ancestor. The more closely related the two species are, the more similar their DNA is, indicating they evolved from a recent common ancestor.
Detailed explanation-5: -They point out that although all humans alive today have mitochondrial DNA passed on from a common ancestor-a so-called Mitochondrial Eve-this is just a tiny fraction of our total genetic material.