Question

Repetitive sequences are stretches of DNA with repeated bases many times in a genome,but (a)These sequences are of no transcriptional function (b) These are associated with euchromatin region (c)These helps to identify a person on the basis of its DNA specificity (1)All are correct (2)Only(b)is incorrect (3)Both(a)&(b)are correct (4)Both(b)&(c)are incorrect

Answer 1

Answer -

Repetitive sequences are stretches of DNA with repeated bases many times in a genome,but

• Option c is correct.

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Answer 2

Repetitive sequences are stretches of DNA with repeated bases many times in a genome, but these are not associated with the euchromatin region.

• These are noncoding → non-transcribing structures present mostly in the heterochromatin region.
• The Heterochromatin region is the condensed chromatin region which is also called the non-transcribing region.
• These are mostly found in the region of DNA called junk DNA.
• Repetitive sequences also help to identify a person as evolutionarily conserved repeating sequences in a particular individual will match its parents, for example, SNPs - single nucleotide repeats.
• Junk DNA provides room for accumulation of mutations which can be rendered non-functional, not affecting the individual.