A recent study examining the mutation rates of 5669 mamm...

Question

A recent study examining the mutation rates of 5669 mammalian genes (17,208 sequences) indicates that, contrary to popular belief, mutation rates among lineages with vastly different generation lengths and physiological attributes are remarkably constant [Kumar, S., and Subramanian, S. (2002). Proc. Natl. Acad. Sci. USA 99:803–808]. The average rate is estimated at 12.2×10⁻⁹ per bp per year. What is the significance of this finding in terms of mammalian evolution?

Accepted Answer

Hi everyone welcome back. Here's our next question which of the following best defines a lilac frequency. When we look at our answer choices. Let's look through them here. The answer choice we're looking for is choice be the frequency at which two alleles are present in a population. So it's important remember we're not looking for how often a given phenotype occurs. So how many individuals in a population show a certain trait in their phenotype. But the frequency at which an alley all occurs in the population. So we calculate that by dividing the number of copies of a specific alley by the total number of alleles in the population, remembering of course that each individual will have in general two copies of every chromosome. So each individual would have two different alleles. So you'd have to take that into account. Let's look over other answer choices to see why they're not correct. Choice. Day says the frequency at which an individual's aliens change over time. The key that tells us this is not a correct answer is the word individual. Um That makes choice a knot or answer choice. We're not talking about what's going on an individual level and whether that's changing. We're looking at just the occurrence of specific alleles within a population choice. E says the frequency at which aliens are inherited from parents. Well this is also not an answer. Um Again, we're looking at what's going on in the whole population. The individuals that are there not how individuals are inheriting specific alleles from their parents. Although of course the frequency at which they inherit from the parents affects the frequency in the population. Joyce D. Says the frequency at which alleles appear in a specific genotype. You can, and this is not our answer because again, we're talking about the occurrence of alleles in an entire population, not just in a specific genotype. So which of the following best defines a low frequency choice be the frequency at which two alleles are present in a population in the next video.

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