Molecular clocks are based on comparisons of the number of mutations between species. a. lethal

step 1 Let's talk about molecular clocks. So the idea is we want to know the time span between, let's s

Molecular clocks are based on comparisons of the number of ...

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Key Concepts

Molecular Clocks

Molecular clocks are methods used in evolutionary biology to estimate the time of divergence between species by measuring the number of accumulated mutations in genetic material. The underlying assumption is that some mutations occur at a relatively constant rate over time, allowing scientists to use these changes as a 'clock' to date evolutionary events.

Neutral Mutations

Neutral mutations refer to changes in DNA sequences that do not affect an organism's fitness. In the context of molecular clocks, it is the accumulation of these neutral mutations, which are neither advantageous nor disadvantageous, that provides a reliable metric for estimating evolutionary timescales. This concept is central to the neutral theory of molecular evolution, which suggests that most evolutionary changes at the molecular level are the result of genetic drift acting on neutral mutations.

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