If autopolyploidy is responsible for the formation of a tetraploid grape (with extra-large fruit) from a diploid population (with smaller fruit), which of the following events must have occurred?
A. Mating of diploid individuals to individuals from a different species of grape
B. Doubling of chromosome number in the diploid population
C. Halving of chromosome number in the diploid population
D. A point mutation that produces extra-large fruit
Ans: B. Doubling of chromosome number in the diploid population
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