Read the definitions and write the words. 1 the complete set of genetic material of a human, animal, plant, or other living thing 2 the study of how, in all living things, the characteristics and qualities of parents are given to their children by their genes 3 the simplest unit of a chemical substance, usually a group of two or more atoms 4 an animal with no spine 5 the way in which genes change and produce permanent differences 6 the structure of a DNA molecule 7 exactly the same, or very similar