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:
An allele is one of many forms that a genetic marker may take. DNA markers may differ in size or in the arrangement of the molecules (A, T, C and G). These differences make each personâs DNA profile unique. genetic marker or locus indicates the position of DNA on a chromosome. The word âlociâ is often used to describe the genetic markers used for DNA testing. For example, D3S1358 the D marker is on the 1358th locus described on chromosome 3.