Multiple choice Which of the following processes of gene duplication involves unequal crossing over? Replication slippage Ectopic recombination Retrotransposition Aneuploidy Reveal answer Fill a bubble to check yourself B Correct answer Explanation Ectopic recombination involves unequal crossing over. In ectopic recombination, crossing over occurs between non-homologous chromosomes during meiosis. Duplication occurs at the site of exchange.