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(Genetic Traits)

In the past, identifying familial relation was mainly based on physiognomy (an ancient science of establishing a familial relation between a child and the father) in the absence of confession and witness, and then discovery of genetic traits or marks was made through laboratory blood test.

Hence, Blood is an embodiment of many of these genetic traits inherited from the father and mother as a child takes half the real qualities of his father and the other half from the mother through the sperm of a man, and the female egg. 

Genetic traits found in the blood (includes the following):

1-Main blood groups:

To every human are some qualities and features in the blood different from others, and the evident of this is that, if two different types of blood are blend together they will not get mixed if they are of different blood groups, which are four (4): A, B, AB, zero. These (four blood groups) have unique properties known to doctors.

Method of identifying a blood group:

1-By Using a Microscope: Blood type identified, remain constant for each person and passed from parent to child. 

2- DNA imprint: To establish the distinction of a human being from another can be by the DNA that is found in cells of the body except red blood cells, where it has no nucleus. 
The nucleus of each cell of the body contains 23 pairs of chromosomes, including (22) similar ones between male and female. And differ in one which is a sex chromosomes and each has its own code cells. 
For example, it can be known through hair cells whether it is male or female, as well as in the identification of blood, saliva and skin. 
It was found that the unity of the construction of these chromosomes is DNA. Each DNA consists of helical chains wrapped around each other. This sequence varies from one person to another. Similarity does not happen only in the case of identical twins because its origin is one egg and one sperm. 

This is science is known as (DNA) considering this difference.  This DNA or genetic information is responsible for the genetic traits gained since the start of the creation of man: namely, (legacies that show everyone particulars). 
The findings of modern science in the discovery of DNA footprint is only for genetic qualities only, and does not discover  other millions of information about the human in his lifetime and after his death (Allah says):

وَمَآ أُوتِيتُم مِّنَ ٱلْعِلْمِ إِلَّا قَلِيلًا

“…and you were given only little knowledge." (Al-Israa’: 85)



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