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DNA Similarities - DNA Similarities This could be an...

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DNA Similarities This could be an assignment but I am going to give you the answers and use it as a study sheet. You get to answ own a bit later on... Suppose you could compare the total DNA sequences of various organisms (some billions of base pairs). How m similarity would you expect between a whale and a fish? A whale and a dog? A dog and a shrimp? A shrimp and bacterium? As always, there are two types of similarity to be considered: analogy and homology. If the sequence similarity because they code for proteins with similar functions, analogy would be the explanation. If the sequenc similarity because of common ancestry, then it is homology. We now have techniques for determining DNA sequences rapidly, and we know the sequences of substantial reg DNA for many organisms. In fact, a project to determine the entire human DNA sequence, funded by the Nation Foundation, is under way now and has already yielded some surprising preliminary data. Surprisingly, only a sm of the DNA of higher plants and animals is actually genes. Some of the rest is involved in controlling when gene
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