Not necessarily - you don't need parents DNA to do those tests.
Also DNA sequencing is one of those areas which experienced incredible cost reduction, much faster than for example general computing power under Moore's law. I.e. it used to be very very expensive. Heck, the first complete human genome sequencing was completed just 16 years ago, and the project took 13 years.
Also DNA sequencing is one of those areas which experienced incredible cost reduction, much faster than for example general computing power under Moore's law. I.e. it used to be very very expensive. Heck, the first complete human genome sequencing was completed just 16 years ago, and the project took 13 years.