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

Answer;
DNA replication allows the basic units of heredity found on segments of DNA, called genes, to be passed on from parent to offspring. 

Explanation;
DNA replication involves the synthesis of other new DNA helices from the parent DNA helix in which the two strands of the parent DNA acts as templates to synthesize new complementary strands. This is a semi-conservative process in which the new DNA helix contains one strand from the original DNA and one new strand.  
By so doing the process allows genes (segments of DNA) to be passed from the parents to the offsprings.

Reproduction i think