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Repetitive dna

repetitive DNA

(Science: molecular biology) nucleotide sequences in dNA that are present in the genome as numerous copies. Originally identified by the C0t_ value derived from kinetic studies of dNA renaturation. These sequences are not thought to code for polypeptides. One class of repetitive DNA, termed highly repetitive DNA, is found as short sequences, 5-100 nucleotides, repeated thousands of times in a single long stretch. It typically comprises 3-10% of the genomic DNA and is predominantly satellite DNA. Another class, which comprises 25-40% of the DNA and termed moderately repetitive DNA, usually consists of sequences about 150 to 300 nucleotides in length dispersed evenly throughout the genome and includes alu sequences and transposons.


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Re: Theories - Origin of Life

... processes. � Major alterations in the content and distribution of repetitive DNA elements results in a reformatting of the genome to function in novel ways --without major ...

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by scottie
Mon May 23, 2011 8:28 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 907275

linkage disequlibrium, haplotypes, SNPs

... random association of alleles at different loci (they form a block of DNA that is inherited together). When there is a preferential association ... And how do you know which tag SNPs to look for? Sorry, I know it's repetitive, I just want to check if my thoughts are correct? Thanks!

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by tou
Thu Apr 21, 2011 12:11 am
 
Forum: Genetics
Topic: linkage disequlibrium, haplotypes, SNPs
Replies: 1
Views: 1766

Re:

... You probably misunderstood, hopefully miswillingly. I didn't say, that DNA is crap, I referred to crap DNA, as I forgot the correct vocabulary 'junk ... in expression regulation through siRNA, but I'm talking about the repetitive sequences and retrotranspozones. Why did the creator give us the ...

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by Zenithar66
Mon Apr 04, 2011 10:17 pm
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 309
Views: 538967

Any SOLID arguments against evolution?

... You probably misunderstood, hopefully miswillingly. I didn't say, that DNA is crap, I referred to crap DNA, as I forgot the correct vocabulary 'junk ... in expression regulation through siRNA, but I'm talking about the repetitive sequences and retrotranspozones. Why did the creator give us the ...

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by JackBean
Mon Apr 04, 2011 9:43 pm
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 309
Views: 538967

Why do chromosomal deletions occur more at certain regions?

Another one would be chromatin modeling. When DNA is exposed as single strands/double strands being temporarily separated, then a break or base pairs pairing up (especially at repetitive sequences - loops back on itself - and can then be either excised out or stays ...

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by kolean
Thu Jan 13, 2011 2:52 pm
 
Forum: Genetics
Topic: Why do chromosomal deletions occur more at certain regions?
Replies: 1
Views: 1509
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