Two diploid species of wheat were crossed to yield a hybrid plant. The resulting

Question

Two diploid species of wheat were crossed to yield a hybrid plant. The resulting hybrid was sterile and could not produce progeny from seed. A cutting was taken and treated with colchicine. Plants grown from the cutting were larger and produced hearty grain. They were designated species 3. The grain could be planted to produce additional progeny, all of which were also fertile Describe the genetic process schematically by filling in the blanks below, using A to describe the chromosome complement of species 1 and B to describe the chromosome complement of species 2 The term that best descnbes species 3 is Aneuploid Allopolyploid Autotetraploid All of the above terms apply

Explanation / Answer

species 1 diploid x species 2 diploid

                       hybrid ----diploid

addition of colchicine arrest the division leads to formation of

autotetraploid

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