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OCR A Biology

Chromosome Section Breaks Mutations Joins Gene Single Gene/Sections

Chromosome mutations involve changes to entire chromosomes, such as deletion, duplication, translocation, and inversion of segments, often caused by mutagens during meiosis.

Chromosome mutations affect entire chromosomes, unlike gene mutations. These include deletion, duplication, translocation, and inversion of chromosome segments.

Front Chromosome mutations
Back
  • gene mutations in single gene/sections of DNA, CM affects whole chromosome, and caused by mutagens and occur during meiosis normally
  • Changes in chromosome structures include
    • deletion - section of chromosome breaks off and lost
    • duplication - sections get duplicated on chromosome
    • translocation - section of 1 chromosome breaks off and joins another non-homologous chromosome
    • inversion - section of chromosome breaks off, is reversed, and joins back onto chromosome

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