Two unrelated species of plants were hybridized. Species A is described as 2n =
ID: 34241 • Letter: T
Question
Two unrelated species of plants were hybridized. Species A is described as 2n = 16. Species B is described as 2n = 10.
How many chromosomes are in the hybrid? _______
Fill in the number of univalents and bivalents you would expect to see in meiosis in this hybrid.If none of a type are seen, fill in 0.
Univalents__________
Bivalents___________
The number of chromosomes can be doubled in the lab using the chemical _________.
Assume that the number of chromosomes in the hybrid was doubled using the chemical above. The resulting plant is most likely (fertile or sterile).__________
Fill in the number of univalents and bivalents you would expect to see in meiosis of this final hybrid. If none are seen, fill in 0.
Univalents ________
Bivalents _______
Explanation / Answer
The chromosomes in the hybrid will be intermediate between the parents i.e. 2n = 13
No. of bivalents = 6
No. of monovalents = 1
Chemical used for chromosome doubling= colchicine, Nicotine Sulfate , oryzaline and trifluraline
The resulting plant is sterile
No. of bivalents after chromosome doubling in final hybrid = 13
No. of monovalents after chromosome doubling in final hybrid =0
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