Answer:
A sequence of DNA can encode different gene products (overlapping genes), whereas each specific nucleotide letter in this sequence can not be used by two different codons (i.e., genetic code is nonoverlapping)
Explanation:
The overlapping genes are nucleotide sequences transcribed in two (or more) different messenger RNAs (mRNAs), which are subsequently translated in two (or more) unrelated proteins. The overlapping genes are originated by an evolutionary process known as overprinting, where mutations in an Open Reading Frame (ORF) enables the emergence of a second ORF that encodes a new functionally unrelated protein. On the other hand, the codons in the nucleotide sequence do not overlap, i.e., one specific letter (nucleotide) is used only by one single codon. It is for that reason that the genetic code is nonoverlapping.
