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:
DNA markers don't, by themselves, identify the gene responsible for the disease or trait; but they can tell researchers roughly where the gene is on the chromosome. This is why: when eggs or sperm develop, the paired chromosomes that make up a person's genome exchange stretches of DNA.