Chromosomes are organized structures of DNA and they carry the genetic information of an organism. The number of chromosomes varies in different organisms. Human cell contains 46 chromosomes, which occur as 23 pairs (22 pairs of autosomes and one pair of sex chromosomes). In each pair, one chromosome is from mother and another is from father.
Gene is a specific area on chromosome which contains all the information that is necessary to produce single type of protein molecule.
Thus, the blanks can be filled with 23; protein.