Aset of characteristics that defines individuals as boys and men or girls and women is called

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.