Mutation Rate - Measurements Of Mutation Rate, Human Mutation Rates, Factors Influencing The Mutation Rate, The Origin Of Spontaneous Mutations
determine generation
Mutation rate refers to the frequency of new mutations per generation in an organism or a population. Mutation rates can be determined fairly precisely in experimental organisms with short generation times, such as bacteria or fruit flies. Human mutation rates are more difficult to determine accurately. Mutation rates can be used as a "molecular clock" to determine the time since two species diverged during their evolution.
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Mutation rate is often difficult to measure. The frequency of existing mutations in a population is not a good indication of the mutation rate, since a single mutation may be passed on to many offspring. In addition, there are often selective pressures that increase or decrease the frequency of a mutation in a population. Mutation rates differ widely from one gene to another within an organism and…
The appearance of rare dominant genetic diseases, such as retinoblastoma, have been used to estimate the mutation rate in the human population. Retinoblastoma is a childhood cancer of the eye and was a lethal condition until recently. Hence almost every case represented a new mutation (because individuals with the condition did not survive to reproduce and pass the genetic propensity for the disea…
Within a single organism, the mutation rate of two genes can differ by a thousandfold or more, so within a species some mutations may be very rare and others quite common. Exposures to very high doses of very potent mutagens can increase the mutation rate per generation by more than a hundredfold. Both the nature of the gene and its environment can influence the mutation rate. The size of the gene…
While it may seem unlikely, it is believed that the overall mutation rate within a species does not vary much over long periods of time. This means
that the mutation rate serves as a "molecular clock." The clock can be used to determine the time since the evolutionary divergence of two species. Two organisms with very few DNA sequence differences between them diverged more recently …
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