Linkage · Botany

When two dominant alleles are present on one chromosome and two recessive alleles on the homologous chromosome, the arrangement is called:

  1. Trans-arrangement (Repulsion)
  2. Cis-arrangement (Coupling)
  3. Inversion
  4. Translocation
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Correct answer: Cis-arrangement (Coupling)

In the coupling or cis-arrangement (AB/ab), both dominant alleles are on the same chromosome. In the repulsion or trans-arrangement (Ab/aB), one dominant and one recessive allele are paired on each chromosome.

Difficulty: Medium Question 8 of 20

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