Evolutionary distance measurement sequence. amplified by the assumption that a point mutation is equally likely along the entire gene sequence. List two reasons this assumption may not hold true.
Added by Jayce C.
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Non-random mutation rates: The assumption that a point mutation is equally likely along the entire gene sequence may not hold true if certain regions of the gene are more prone to mutations than others. For example, certain regions may have a higher mutation rate Show more…
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If two species have homologous genes with sequences that match closely, biologists conclude that these sequences must have been inherited from a relatively recent common ancestor.
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The following two statements explain the logic behind the use of molecular sequence data to estimate evolutionary relationships: "If the theory of evolution is true, then rRNA sequences should be very similar in closely related organisms but less similar in organisms that are less closely related"." "On a phylogenetic tree, branches that share a recent common ancestor represent species that are closely related; branches that don't share recent common ancestors represent species that are more distantly related"." Is the logic of these statements sound? Why or why not?
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