Biology for IGCSE & O level - Variation And Selection (Section 3 - No. 18)
In the context of the tomcod fish and PCB resistance, what is the role of random mutation?
It causes the PCBs to break down.
It provides the raw material for natural selection.
It directly causes the fish to develop resistance.
It is unrelated to the fish's resistance to PCBs.
Explanation
Random mutation introduces genetic variation, some of which can be beneficial in certain environments.
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