A collection of particular persons or items, formed into one body; as a corporation aggregate, which is one formed of a number of natural persons; the union of individual charges make an aggregate charge.
Pleiotropy describes the genetic effect of a single gene on multiple phenotypic traits. The underlying mechanism is that the gene codes for a product that is, for example, used by various cells, or has a signaling function on various targets.A classic example of pleiotropy is the human disease phenylketonuria (PKU).nsourced material may be challenged and removed. (September 2013). Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits, an example being phenylketonuria, which is a human disease that affects multiple systems but is caused by one gene defect.
Allotropy : Existence of an element into more than one physical forms E.g: Coal, lamp black, coke, Diamond, graphite. Allotropy refers to an element, it should be reserved for the different crystalline phases of a given pure element. Polymorphism is a more general term referring also to intermediate phases. Polytypism has a structural meaning: 'Polymorphism' where the polymorphs differ by the stacking sequence of a given type of layers.