Answer: The correct answer for the blank is- gene.
Gene can be described as the segment of DNA (deoxyribonucleic acid) that codes for a particular protein.
The protein is formed through transcription (formation of mRNA from DNA) and translation (formation of protein from mRNA) of gene.
The protein formed corresponds to a specific trait (such as hair color, eye color). Thus, gene depicts a particular trait of an organism.
Gene is considered as the unit of heredity as it is transferred from parents to their offsprings in the form of DNA sequences.
