1 Usually, staph bacteria donât cause any harm. 2  However,if they get inside the body they can cause an infection. 3  When common antibiotics donât kill the staph bacteria, it means the bacteria have become resistant to those antibiotics. 4  This type of staph is called MRSA (Methicillin-Resistant Staphylococcus aureus).
A genetic marker is defined as a specific gene or DNA sequence that produces a detectable trait with a known location on a chromosome and that can be used to study family and population, identification of cells, species or individual. Introduction:
Explain what genetic markers are, and describe how scientists use them. Genetic markers make it possible to distinguish bacteria that carry plasmids and foreign DNA from those that do not; genetic markers are inserted into plasmids so that scientists can identify transformed bacteria.