1. Crossing Over: This occurs during meiosis, specifically in prophase I. Homologous chromosomes (one from each parent) pair up and exchange segments of DNA. This results in the shuffling of alleles between chromosomes.

2. Independent Assortment: During meiosis, chromosomes from each pair (one from the mother and one from the father) are randomly sorted into daughter cells. This independent assortment of chromosomes creates genetic diversity.

3. Random Fertilization: During sexual reproduction, any sperm can fertilize any egg, leading to even more genetic diversity. This random combination of paternal and maternal genes further increases the variety of offspring.