Question

102. Root cells of wheat has 2n = 42 chromosomes. Which one
of the following is the basic chromosome number of wheat
[WB JEE 2010]
(a) 42
(b) 21
(c) 7
(d) 14​

Answer 1

42

Common wheat is hexaploid. So the diploid chromosome number of 42 actually means six sets of basic chromosome number, i.e., each basic set is made up of 42 divided by 6 or 7 chromosomes.