The percentage of bees in a population with a resistant gene rose from 5% to 40% over five years after a pesticide was used. Which statement is the best explanation?
Answer and explanation
Correct answer: A. Resistant bees survived, reproduced and passed on the allele
- Step 1: Pesticide kills non-resistant bees.
- Step 2: Resistant bees breed, so the allele frequency rises: natural selection.
Answer
Resistant bees survived, reproduced and passed on the allele.
Why not the others: The pesticide caused the new gene in each bee: mutations arise before selection. Bees chose to become resistant: organisms cannot choose mutations. The bees changed colour to hide: colour is not mentioned.
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