During sexual reproduction, traits from both parents of an organism combine to form a new set of traits. For a given set of selection pressures in the surroundings of a population, the combinations of genes dictate whether the organism has favorable or non-favorable traits. Thus, natural selection is dependent on reproduction.
This would be the punnet square:
PT Pt pT pt
pt PpTt Pptt ppTt pptt
pt PpTt Pptt ppTt pptt
I t can tell you a if something is a multicellular cell or if it isn't a multicellular cell because you might get a different discovery every time you look at a stem cell
