Q. Plant A is having chromosome no. 2n = 12 and B having 2n = 16. Both are crossed to form allotetraploid C. What is the chromosome number of C?

Q. Plant A is having chromosome no. 2n = 12 and B having 2n = 16. Both are crossed to form allotetraploid C. What is the chromosome number of C?

1. 32
2. 14
3. 28
4. 7

Solution :

Correct option : C Plant A has chromosome number 2n = 12; thus, n = 6
B is having 2n = 16; n = 8.
Thus, combination yields 6+8= 14= 2n. Thus, n =7.
Allotetrapolidy, 4n = 4 x 7 = 28.