During the pairing of homologs in prophase of meiosis I, the region of a normal, nondeleted chromosome that has nothing with which to recombine forms a

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When a homologous pair of chromosomes come together during prophase of meiosis I, a region of a normal, nondeleted chromosome that has no matching partner on its homologous chromosome forms a deletion loop. This loop is formed because the homologous recombination cannot occur in this region, which creates an unpaired section of the chromosome. This results in a deletion heterozygote, where one homologous chromosome has a deleted segment, and the other does not. Therefore, the best choice is D - deletion loop.

During the Pairing of Homologs in Prophase of Meiosis I