gene n - a self-replicating protein molecule that occupies a fixed place on a chromosome; a unit of heredity
generation n - group of genetically related organisms constituting a single step in the line of descent
genetic adj - of or relating to or produced by or being a gene; tending to occur among members of a family usually by heredity
genetic drift n - the tendency for random fluctuations in the frequency of the appearance of a gene or genes to occur in a population of plants, particularly when cloning is repeated on each successive generation of clones, getting further form the original mother plant, resulting in an unstable genetic make-up and morphological abnormalities
germinate v - to cause a seed to sprout
greenhouse n - a building, with glass or plastic walls and roof, used to shelter and cultivate plants under controlled conditions
growing medium n - any of a number of substances such as soil, rockwool (see rockwool), perilite, etc that is used as a substrate to support and provide a plant with nutrients | 
