Re: What's the proper name/term for genetic abberation after birth?

Isaac,

I think your definition of mutant is inaccurate. A mutant is any cell or 
organism carrying a mutation and mutations occur at the level of the gene. 
Genes incur mutations which gives rise to differences at the cellular and 
organismal levels. Being "mutant" has nothing do with when (i.e., before 
or after birth in the case of humans or other animals)you receive the 
mutation. The mutation makes an organism different from their parents at 
the level of the DNA, but may or may not give the "mutant" a different 
trait or phenotype from the parents. A trait differing from that of either 
parent would depend on whether the mutant gene is expressed or not.