- Selective breeding is when humans breed animals and plants for desired traits. Inbreeding breeds closely related individuals while outbreeding crosses distantly related organisms. - Meiosis is the cell division process for sexual reproduction that results in cells containing one set of chromosomes. Polyploidy occurs when cells contain more than two sets of chromosomes. - Colchicine prevents cell division after chromosome replication, resulting in polyploid cells. Chromosomes are structures containing DNA, protein, and RNA found in cells.