For sickle-cell disease assume s is the dominant allele and s the ressive allele which genotypes are possible for offspring of a carrier ss and a person who lacks the sickle-cell

The possible genotypes are Ss and ss

yes you are doing it right great gob

explanation:

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).