1. In your body, why do muscle cells and skin cells look and behave differently? (Points : 1) They have different genes. Their genes are being expressed differently. The same genes are being expressed in both types of cells. There is no similarity in their chromosomes. Question 2. 2. Which genes are present in your liver cells? (Points : 1) All your genes are present in your liver cells. Only the genes needed by your liver cells are present in those cells. Half the number of genes is present in your liver cells.