Key points. The differences in characteristics between individuals of the same species is called variation . Some variation is passed on from parents to offspring, via genes during reproduction. This is inherited variation. Some variation is the result of differences in the surroundings, or what an individual does.
The right answer is B.
Thus, cancer is the consequence of an accumulation of genome alterations, somatic mutations (mutation affecting all types of cells except germ cells).
The mutation rate can be increased by some agents of the environment. This is the case of ultraviolet (UV) radiation that causes DNA damage and is responsible for many but not all skin cancers.
Answer:
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The answer is the option B. 4%
To have two copies of the recessive a allele, consider acquiring the a allele twice as two independent events (multiply probabilities).
(.2)(.2) = .04 = 4%