Why is it necessary for each pea plant to have two sets of all genes, one from each parent?

Having two sets of all genes, one from each parent, is necessary for several reasons. First, it provides genetic diversity, enhancing the adaptability and survival of the population in changing environments. Second, it allows for the masking or expression of recessive or dominant alleles, influencing the phenotypic traits of the individual. Third, it promotes genetic stability by providing a backup copy of each gene. If one gene is mutated or damaged, the other copy can still perform the necessary function. Overall, having two sets of genes through sexual reproduction contributes to the robustness and versatility of the organism and its offspring.