OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Two closely related organisms have similar DNA sequences.
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Two closely related organisms have identical DNA sequences.
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Two closely related organisms have no proteins in common.
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Two closely related organisms have completely different DNA sequences.
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Detailed explanation-1: -The basic idea behind this approach is that two species have the “same” gene because they inherited it from a common ancestor.
Detailed explanation-2: -For example, 96% of the genes in humans and chimpanzees are identical. That two species and their common ancestor have similar DNA is strong evidence supporting evolution.
Detailed explanation-3: -Chimpanzees and humans turn out to be very similar-if you look at their DNA. When scientists determined the entire genetic code of both humans and chimpanzees, they found that we have over 98% identical DNA.
Detailed explanation-4: -One class of biochemical evidence of evolution, homologous molecules, is biochemicals that are very similar in structure and function in all organisms. An example of a homologous protein is cytochrome c. This protein is found in almost all living cells and plays a key role in cellular respiration.
Detailed explanation-5: -Answer and Explanation: The DNA of two closely related organisms will be more similar than the DNA of two distantly related organisms.