Multiple choice

Species differentiation and production of different varieties in many plants are brought about by

  1. the chromosomes that have a region represented twice

  2. the placement of the genes in the reverse order of the normal order in a segment of a chromosome

  3. the reduction in the number of genes in a particular chromosomes

  4. interchange of chromosome segments between non-homologous chromosomes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Interchange of chromosome segments between non-homologous chromosomes is called translocation. Translocations can create reproductive barriers and lead to speciation because individuals with different translocation arrangements may have reduced fertility when mating. The other options describe chromosomal duplications, inversions, and deletions, which are less likely to cause species differentiation on their own.

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