chromatin is the name of the string of repetitive dna at the tip of each chromosome in the body.
chromatin is the name of the string of repetitive dna at the tip of each chromosome in the body.
what is the name of the string of repetitive dna at the tip of each chromosome in the body?
chromatin
a main disadvantage of conventional cgh is its inability to detect structural chromosomal aberrations without copy number changes, such as mosaicism, balanced chromosomal translocations, and inversions. cgh can also only detect gains and losses relative to the ploidy level. in addition, chromosomal regions with short repetitive dna sequences are highly variable between individuals and can interfere with cgh analysis. therefore, repetitive dna regions like centromeres and telomeres need to be blocked with unlabeled repetitive dna (e.g. cot1 dna) and/or can be omitted from screening. furthermore, the resolution of conventional cgh is a major practical problem that limits its clinical applications. although cgh has proven to be a useful and reliable technique in the research and diagnostics of both cancer and human genetic disorders, the applications involve only gross abnormalities. because of the limited resolution of metaphase chromosomes, aberrations smaller than 5–10 mb cannot be detected using conventional cgh.
comparative genomic hybridization
simple eukaryotes such as "c. elegans" and fruit fly, have more non-repetitive dna than repetitive dna, while the genomes of more complex eukaryotes tend to be composed largely of repetitive dna. in some plants and amphibians, the proportion of repetitive dna is more than 80%. similarly, only 2% of the human genome codes for proteins. 









































section::::eukaryotic genomes.:noncoding sequences.









































noncoding sequences include introns, sequences for non-coding rnas, regulatory regions, and repetitive dna. noncoding sequences make up 98% of the human genome. there are two categories of repetitive dna in the genome: tandem repeats and interspersed repeats.









































section::::eukaryotic genomes.:noncoding sequences.:tandem repeats.
genome