Doubling the chromosomes of a sterile species hybrid with colchicine or cold shock is a method used to produce a fertile species hybrid called a ____.
A)autoploid
B)allopolyploid
C)amphidiploid
D)triploid
E)autoallopolyploid

Question

Doubling the chromosomes of a sterile species hybrid with colchicine or cold shock is a method used to produce a fertile species hybrid called a ____.
A)autoploid
B)allopolyploid
C)amphidiploid 
D)triploid
E)autoallopolyploid

Quizplus · Accepted Answer

Doubling the chromosomes of a sterile species hybrid with colchicine or cold shock creates an amphidiploid, which is a fertile species hybrid with an even number of chromosomes. Autoploid and allopolyploid refer to different types of polyploids, but do not specifically relate to the method of doubling chromosomes in a sterile hybrid. Triploid and autoallopolyploid refer to specific chromosome number and combination situations, but do not reflect the process of creating a fertile hybrid through chromosome doubling.

Doubling the Chromosomes of a Sterile Species Hybrid with Colchicine