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A-Level Biology OCR A

Tightly Dna Genes Define Heterochromatin Explain Significance Expression

Heterochromatin is tightly wound DNA, making it condensed and inaccessible for transcription by RNA polymerase, thus preventing gene expression.

Heterochromatin is tightly wound DNA, making it condensed and inaccessible for transcription by RNA polymerase, thus preventing gene expression.

Front Define heterochromatin. + explain significance in gene expression
Back Heterochromatin - tightly wound DNA (makes it visible during cell division)
  • Transcription of genes is not possible when DNA is tightly bound bc RNA polymerase can't access genes

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