An amphidiploid between B. nigra and B. campestris is

An amphidiploid between B. nigra and B. campestris is Correct Answer B. juncea

An amphidiploid between B. nigra and B. campestris is B. juncea.
Brassica juncea is an amphidiploid having in its genetic system the full 20-chromosome A genome (Brassica campestris) and the 16-chromosome B genome (Brassica nigra).
Brassica juncea belongs to the mustard family (Brassicaceae or Cruciferae) and has numerous common names used, e.g., brown mustard, Chinese mustard, or oriental mustard.
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