While some of our DNA are genes that code for enzymes and other proteins, most of our DNA is junk. It has no purpose, just repeated chains of base pairs and old mutations. Some parts of Chromosomes mutate frequently and are very changeable. They will copy and repeat themselves, or individual base pairs will change and swap out. Other parts of Chromosomes mutate very slowly and the sequences will remain intact for many generations. These parts are used as genetic markers as they are passed down through generations unaltered and are specific to a species, or a wave of historical human migration, or down to the level of a family group.
In BladeRunner, I understood the mention of genetic markers to be a kind of barcode giving date and place of manufacture. If the Replicant reproduced and had a child, and this was a code written into their DNA, then certainly, the genetic markers could be passed on to their offspring, except that you are assuming that Replicants can reproduce and have children. I thought they were deliberately made both infertile, and with a limited lifespan. I'm not sure that the infertility was ever explicitly mentioned though, while the limited lifespan was. As Swank mentioned, they appeared to be put together from spare parts rather than grown from a single cell, in which case their cells will not have identical DNA, so unlikely.
However, there is another reason why I don't think they can reproduce. They were a very expensive piece of kit, used by Corporations to mine inhospitable planets and such, where humans could not do so. It wouldn't make any sense for The Tyrell Corporation to make androids that could reproduce themselves. If they could reproduce themselves then you would never need to buy another from Tyrell. Or else, in a few years you could build an army of them. It is a similar thing with GM crop seeds. If you can harvest fertile seeds and plant them the following year, then you'd never need to go back to Monsanto for more. I expect the genetic markers/ barcode is there to prevent this. Its presence would identify which original Replicant the offspring came from and therefore who had broken their contract with Tyrell. Even if it were possible to make one that was fertile, then it would be an extra expense for Tyrell with no profit for them. I could see it being a hack that was asked for once you bought one, from some illegal repair shop.