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Question

In the hexaploid wheat (42 chromosomes), the haploid (n) and monoploid (x) number of chromosomes are:
  1. n = 21 and x = 21
  2. n = 21 and x = 14
  3. n = 21 and x = 7
  4. n = 7 and x =21


Solution

The correct option is C n = 21 and x = 7
The monoploid (x) number is the number of chromosomes in a single set. Since the number of chromosomes in hexaploid wheat is 42, the monoploid  number will be 426=7. The haploid (n) number is the number of chromosomes in a gamete. For hexaploid wheat, the gamete will be triploid. The haploid number of chromosomes =7×3=21. 

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