The genetic constitution of an organism, as opposed to its actual appearance, which is called the phenotype. The distinction allows for recessive genes and polygenes, which may be present but not expressed because of heterozygosity. Genus

In the taxonomic hierarchy, a genus is a subdivision of a botanical family, and it normally constitutes a number of species . A genus is group of closely related species, which have clearly defined characteristics in common. All plants have two Latin names; the first is the generic name, and the second is the specific name. The adjectival form is 'generic', as in inter-generic hybrid. Geometric series

The series 20, 21, 22, 23, etc., with arithmetic values 1, 2, 4, 8, etc., is a geometric series. This series is relevant to the Habgood nomenclature, and the Person-Habgood differential interaction. Geotropism

The response of a plant to gravity. A tap root exhibits positive geotropism, and grows downwards. An apical shoot exhibits negative geotropism, and grows upwards.

Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

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