Genes are tiny structures inside cells that control the growth and change of cells. They are like a series of instructions for building organisms and making them function normally. Whether it is tiger, toadstool (a poisonous mushroom) or human Genes are contained in cells in an organism. Your genes determine your appearance, from the color of your hair to your long tail. These are all determined by genes. Obviously the environment also affects your appearance, but genes The role is decisive. What does this passage say? ['Structures that function as instructions are genes.', 'Every organism may have similar genes.', 'Genes determine everything.', 'Genes determine the appearance of organisms.']