Answer:
The mutation in the MCR1 <em>gene </em>affected the structure and function of the MCR1 <em>protein</em>.
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Answer: the actual size of the population is relatively small.
Explanation:
In relatively small populations, the phenomenon of genetic drift significantly may change the frequencies of the alleles in that population. This consequently affect the genetic structure of the population in context.
Whereas big populations doesn't significantly feel the shakings of this phenomenon because her effects are small and insignificant.
In the ozone layer. That is in the stratosphere.