Food for thought: no human has two hearts. Therefore, by the time a fetus has a heartbeat, it's its own person and aborting it is murder.

I'm cool with that logic. So, let's take it further...

No human has two different genetic codes; therefore, conception creates a second person* and aborting it is murder.

*If I'm getting terminology wrong (like it's DNA code not genetic code or whatever), please correct me so we can focus on the meat of the idea without distraction.