Reproduction and Variation
Living things make more of their own kind in two very different ways, and the method matters far beyond just producing offspring. It decides how much the offspring vary from their parents, and that variation is the raw material of evolution. This topic pairs reproduction with variation for exactly that reason. This lesson compares the […]
DNA, Genes, and Chromosomes
Inside almost every one of your cells sits a complete set of instructions for building and running you. Those instructions are written in DNA, packaged into chromosomes, and read in units called genes. Getting these three words straight is the doorway to all of genetics, and it clears up a surprising number of test questions. […]
