Any inheritance that is genetically controlled by many genes of small effect, called polygenes. Polygenic inheritance is quantitative in its expression, and it exhibits every degree of difference between a minimum and a maximum, usually with a normal distribution. Polyphyletic
A species that originated by hybridisation from more than one wild progenitor. Polyploid
An organism, usually a plant, which has more than two basic sets of chromosomes. Thus triploid, tetraploid, etc. See also: Allopolyploid, autopolyploid. Pome fruits
Fruits of the botanical family Rosaceae which contain several seeds in a so-called 'core'. The term includes apples, pears, quince, and medlar. See also: Stone fruits. Pomegranite
See: Punica granatum. Poplar
See: Populus spp.
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