double crossover (chromosome arms)

[theonlytycrane]

Are only the inner arms affected in both single and double crossovers?

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[laczlacylaci]

 

[wizzed101]

D is flat out wrong because if 2 arms are affected in double crossover, the centromere will also be involved. That's impossible.

Edit: and there's no "inner" arm. The only rule is that crossover cannot be between 2 arms of the same chromosome.