Chromosomal Aberrations and Consequences · NCERT Biology

Chromosomal aberrations are defined as:

  1. Changes restricted to the nucleotide sequence of a gene
  2. Structural or numerical changes in chromosomes
  3. Errors introduced during transcription of mRNA
  4. Alterations affecting RNA processing and splicing
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Correct answer: Structural or numerical changes in chromosomes

Chromosomal aberrations are changes in chromosome structure (e.g., deletion, duplication, inversion, translocation) or number (e.g., aneuploidy, polyploidy). They typically arise from errors during cell division or from unrepaired DNA damage.

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