Principal of Repeated DNA
Naila Rozi1, Nasir uddin khan2, Zuhair Hasnain3

1Naila Rozi, Department of Mathematics, Sir Syed University of Eng.&Technology University , Karachi, Pakistan.
2Nasir Uddin Khan, Department of Mathematics, University of Karachi Name, Karachi,Pakistan.
3Zuhair Hasnain, Department of Agronomy, University College of Agriculture, Bahauddin Zakariya University, Multan, Pakistan
Manuscript received on January 01, 2013. | Revised Manuscript received on January 02, 2013. | Manuscript published on January 05, 2013. | PP: 429-430 | Volume-2, Issue-6, January 2013. | Retrieval Number: E1022102512/2013©BEIESP
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Abstract: DNA sequences in the nuclear diploid genome usually exist as two allelic copies ( on paternal and maternal homologous chromosomes . in addition to this degree of repetition , approximately 40 % of the human nuclear genome in both haploid and diploid cells is composed of sets of closely related nonallelic DNA sequences (DNA sequences families or repetitive DNA).within the considerable variety of different repetitive DNA sequences are DNA sequence families whose individual members include functional genes (multigene families)& also many examples of nongenic repetitive DNA sequence families. 
Keywords: DNA, Multigene families, homologous chromosomes