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Question

In the hexaploid wheat, the haploid (n) and basic (x) number of chromosomes are
  1. n=21&X=14
  2. n=21&X=7
  3. n=21&X=21
  4. n=7&X=21


Solution

The correct option is B n=21&X=7
Ploidy is the number of sets of chromosomes in a cell. Cells are described according to the number of sets present (the ploidy level): monoploid (1 set), diploid (2 sets), triploid (3 sets), tetraploid (4 sets), pentaploid (5 sets), hexaploid (6 sets), heptaploid or septaploid(7 sets), etc If, the basic number (x) of wheat is 7. Thus the 6x = 2n = 42 and n = 21. 

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