Linkage · Botany

Complete linkage is rarely observed because:

  1. Genes are always located on entirely different chromosomes within the genome.
  2. Chromosomes do not replicate during division.
  3. Linked genes always undergo mutation.
  4. Crossing over occurs almost universally during meiosis.
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Correct answer: Crossing over occurs almost universally during meiosis.

Complete linkage, where no recombinants are formed, is rare because crossing over is a standard biological process. One of the few known examples of complete linkage occurs in male Drosophila.

Difficulty: Medium Question 14 of 20

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