1. A microfluidic chip, comprising: a first domain configured for polymerase chain reaction (PCR) amplification of DNA fragments, the first domain including at least a first reaction reservoir designated for PCR amplification based on a first sample, and a second reaction reservoir designated for PCR amplification based on a second sample; and a second domain including at least a first separation unit coupled to the first reaction reservoir to received first amplified DNA fragments based on the first sample, and a second separation unit coupled to the second reaction reservoir to received second amplified DNA fragments based on the second sample, the first separation unit being configured to perform electrophoretic separation for the first amplified DNA fragments, and the second separation unit being configured to perform electrophoretic separation for the second amplified DNA fragments.