Final answer:
In meiosis of a pericentric inversion heterozygote with a crossover within the inversion loop, all outcomes are possible except for a chromosome with two centromeres. A pericentric inversion includes the centromere, making some outcomes like duplications or deletions of regions more likely than the formation of dicentric chromosomes.
Step-by-step explanation:
All of the following could result from meiosis in a pericentric inversion heterozygote in which a single crossover occurred within the inversion loop except a chromosome with two centromeres. During meiosis, homologous chromosomes that include one with a pericentric inversion must form a special loop structure to align correctly with the non-inverted homolog. A pericentric inversion includes the centromere and can change the relative lengths of the chromosome arms. The pairing leads to increased risk for abnormal recombination during meiosis.
When crossover occurs within the inversion loop during meiosis, it can result in chromosomes with duplicated or deleted regions. However, a completely normal chromosome can also result if the crossover points happen to be symmetrical with respect to the inverted segment. A chromosome with two centromeres, however, is not a typical outcome of such a single crossover event within an inversion loop because the crossover would not generate a duplication of the centromere itself.