Definitions: Heredity is traits you get from your parents. Genetics is the study of heredity. DNA is the building block that decides who you are (they make proteins). Genes are a specific segment of DNA that makes a protein. Proteins are small pieces of your body that make cells. Chromosomes are really long strands of DNA, you have 23 pairs in your body. A mutation is a typo in DNA, it affects how the proteins are made and are sometimes good or bad but most of the time they are indifferent. A dominant trait is a trait in your DNA that overrules other traits. Recessive traits are traits in your DNA that are overruled by other traits. Sexual reproduction is reproduction with another partner, offspring get traits from both parents. Asexual reproduction is reproduction by yourself, offspring are genetic clones of you.