A key distinction is the sex combs on the male's foreleg, a feature that is lacking in females. Another way to tell the sex of flies is to carefully examine the tip of each fly's abdomen. Females tend to have a lighter colored, pointier and longer abdomen. On the other hand, males tend to have a more pigmented, round and short abdomen. In general, women tend to have larger bodies than men. Sex determination can easily be performed even with low-power magnification, making it easier to use fruit flies to study genetics.