Dna replication allows the basic units of heredity found on segments of dna, called
, to be passed on from parent to offspring.

Answer : The correct answer is-

Genes.

Gene can be described as the segment of DNA (deoxyribonucleic acid) that corresponds to particular protein. It is transcribed and translated to produce particular protein, which depicts a specific trait or characteristic of the organism.

Gene is considered as the basic unit of heredity as it is passed from one generation to the next generation (that is from parents to  offspring).

Thus, through replication of DNA, another copy of genes is produced, which is then passed to the next generation.

Therefore, genes is the right answer.