What is radiometric dating in biology

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What is Radioactive Dating? - Definition & Facts

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What is Radioactive Dating? - Definition & Facts - Video & Lesson Transcript | scraptitude.com

The molecular clock is figurative term for a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleotide sequences for DNA or amino acid sequences for proteins. The benchmarks for determining the mutation rate are often fossil or archaeological dates. The molecular clock was first tested in on the hemoglobin protein variants of various animals, and is commonly used in molecular evolution to estimate times of speciation or radiation. It is sometimes called a gene clock or an evolutionary clock. The genetic equidistance phenomenon was first noted in by Emanuel Margoliash , who wrote: "It appears that the number of residue differences between cytochrome c of any two species is mostly conditioned by the time elapsed since the lines of evolution leading to these two species originally diverged. If this is correct, the cytochrome c of all mammals should be equally different from the cytochrome c of all birds.
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Are you preparing for your final biology exam as a ninth grader? The quiz below is meant for you. This first section of the finals quiz is designed to build up your revision before the exam.
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