preformation:- نظرية بطل مفعولها، وتنص على أن التنوع شامل التركيب يوجد داخل الجنين وأن التطور ليس إلا زيادة في الحجم. (المعجم الموحد لمصطلحات علم الوراثة)
preformation:- a theory (popular in the 18th century and now discredited) that an individual develops by simple enlargement of a tiny fully formed organism (a homunculus) that exists in the germ cell (Princeton WordNet 3.1)
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