Final answer:
Long non-coding RNAs (IncRNAs) are a class of eukaryotic RNAs typically not encoded in cpDNA.
Step-by-step explanation:
The category of genes that is typically NOT encoded in cpDNA (chloroplast DNA) is long non-coding RNAs (IncRNAs).
IncRNAs include transcripts of antisense, intronic, intergenic, pseudogene, and retroposon DNA.
While some IncRNAs might turn out to be incidental transcripts that the cell simply destroys, others have a role in regulating gene expression.
These IncRNAs are a yet another class of eukaryotic RNAs and are not typically found encoded in cpDNA.