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:
The 21th genetic marker tested is known as the amelogenin gene and simply determines the sex of the child. However, it is standard procedure to test this gene in a DNA test. Females have a pair of XX chromosomes and males have a pair of XY chromosomes; the sex gene is found on both the chromosomes.