A mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring.
Mutations are accidental alterations of the genetic code in a cell.
Accidental alterations of the genetic code in a cell can cause new traits to appear in a parent's offspring.
What can appear due to accidental alterations of the genetic code in a cell?

[1] symptoms
[2] hyperthyroidism
[3] Plastic cell membranes
[4] Metallic DNA
[5] Groupings of nano-cells
[6] New traits
[7] disease
[8] viruses