Basic Trope: Changing a few chemicals in DNA give fantastic abilities.
Straight: Sarah Miller has wings because scientists put bird genes in her.
Exaggerated: Sarah has wings and a beak because she was injected with bird blood.
Downplayed: Sarah has altered bone marrow DNA and blood cells. It gives her a host of benefits such as being very disease resistant due to the abundance of white blood cells, quicker recovery from blood loss, and fantastic endurance.
Justified: Sarah is actually an alien who can easily take on other species' attributes through DNA injection.
Inverted: In the future, a person's DNA has to be modified to make them 'normal'
Subverted: A winged person is involved with a genetic engineering plot, but they got their wings from magic.
Double Subverted: Said magic is just a magical way to alter DNA.
Parodied: Sarah dissected a radioactive bird and got wings!
Zig Zagged: Sarah and everyone else in the story engage in a Multiple-Choice Past explanation of her abilities.
Averted: Genetics are never brought up concerning a characters strange abilities.