Sam, who has type A blood wants to donate blood to his sister Mia, who has type O blood. Can he donate his blood to her? Why or why not? I need help please

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).