OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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These are the same animal.
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These animals have a common ancestor.
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These animals are not likely related.
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These animals are likely becoming one species.
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Detailed explanation-1: -Q. You look at two species and see very similar DNA. What does this likely tell you? These are the same animal.
Detailed explanation-2: -Answer and Explanation: Finding the same DNA sequence in two different species can indicate a shared common ancestor between the two species. This is because having similar DNA sequences is an example of homology. The more the DNA sequences match up, the more closely related the two species are.
Detailed explanation-3: -Because genes build organisms, DNA carries a record of evolutionary relationships. Some genes are so fundamental that every living thing has them. These genes serve as a record that all life on Earth shares a common ancestor. Organisms that share a lot of traits generally have many more genes in common.
Detailed explanation-4: -Because the DNA sequence determines a protein’s amino acid sequence, a gene shared by two closely related organisms should have similar, or even identical, amino acid sequences. That’s because closely related species most likely diverged from one another fairly recently in the evolutionary span.
Detailed explanation-5: -Molecular clocks are used to determine how closely two species are related by calculating the number of differences between the species’ DNA sequences or amino acid sequences. These clocks are sometimes called gene clocks or evolutionary clocks.