Final answer:
Repetitive sequences do increase chances of heterozygotes if undergoing crossing over during meiosis.
Step-by-step explanation:
True. Repetitive sequences increase the chances of heterozygotes if undergoing crossing over. Crossing over occurs during meiosis I and is the process where homologous chromosomes exchange different segments of genetic material, resulting in recombined alleles. This genetic recombination leads to offspring with a different set of alleles and genes than their parents.