| The graph below shows the effect of radiation on two small inbreeding populations of Drosophila, derived from the same parental stock. |
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| What causes the rise in graph 2? |
A) Spontaneous mutation in a small gene pool
B) Natural selection
C) A decrease in genetic drift
D) An increase in the background radiation
Correct Answer: A
Solution :
Spontaneous mutations are those that occur without a known cause. They may be truly spontaneous, resulting from an inherent low level of metabolic errors (i.e. mistakes) during DNA replication or because of mutagenic agents in the environment which is probably not the cause in this case.
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