Eugene uses his own DNA samples to help Vincent pass as a "valid," or someone with a superior genetic makeup. Vincent attempts to remove as many traces of his own DNA so that he can still qualify as a "valid."
Hank lists the different types of natural selection and explains each of them. He accompanies each type of selection with examples. He also briefly covers artificial selection, also known as selective breeding.
Key Words: Phenotype, Genotype, Modes of Selection, Directional Selection, Stabilizing Selection, Disruptive Selection, Sexual Selection, Directional Sexual Selection, Artificial Selection