This is the second step of production of proteins where mrna is decoded to produce a specific polypeptide.

Question: This is the second step of production of proteins where mrna is decoded to produce a specific polypeptide.

Translation - It is decoded by the ribosome in order to produce a polypeptide or amino acid chain that is specific. Thus, it is the second step in terms of production of proteins.

 I believe that the answer is that a chromatid is one half of a replicated chromosome, whereas chromosome consist of DNA wrapped around proteins in a highly organized manner.  A chromosome is made up of two chromatids which are joined by the centromere. The chromatids separate from each other during mitosis to form two new chromosomes. The DNA making up a chromosome is dispersed as chromatin.