Final answer:
Messenger RNA (mRNA) is the type of RNA that carries the genetic information for polypeptide synthesis from DNA to the ribosomes, where proteins are assembled.
Step-by-step explanation:
The types of RNAs that carry genetic information for polypeptide synthesis are messenger RNA (mRNA). The mRNA carries the genetic message from DNA in the nucleus to the ribosomes in the cytoplasm, where proteins are assembled. This RNA contains the genetic code that specifies the amino acid sequence in the polypeptides being synthesized. While other types of RNAs like transfer RNA (tRNA) and ribosomal RNA (rRNA) are involved in the protein synthesis process, it is the mRNA that carries the actual code that dictates the sequence of amino acids in a protein.