Articles > Quizzes & Surveys > Chromosomal crossoverdefinition – quiz Chromosomal crossoverdefinition – quiz Quiz Choose the best answer. 1. Chromosomal crossover is the natural pairing up and exchanging of genetic material between extranuclear chromosomes any chromosomes homologous chromosomes 2. When does chromosomal crossover occur? Meiosis I Meiosis II Mitosis 3. What is the importance of crossover? New genetic combinations To clone a chromosomal segment For meiosis to occur 4. What causes unequal crossover Pairing up of homologous chromosomes Exchanges of equal genetic material Exchanges of unequal amounts of genetic material 5. Mismatched sequence due to non-homologous crossover may result in ... Insertion mutation Deletion mutation Insertion or deletion mutation Send Your Results (Optional) Your Name To Email Time is Up!