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 (or allotropism) is when a chemical element can exist in two or more different forms in the same physical state or phase. These different forms are called allotropes. Therefore, an allotrope is a different structure in which an element appears. This happens when the atoms of the element are bonded together in a different way. For example, the allotropes of carbon include: 1  diamond, where the carbon atoms are bonded together in a four-cornered lattice arrangement; 2  graphite, where the carbon atoms are bonded together in sheets of a six-sided lattice; 3  graphene, single sheets of graphite; and.