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In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are
A
n = 21 and x = 21
B
n = 21 and x = 14
C
n = 21 and x = 7
D
n = 7 and x = 21
Detailed Solution
The basic number (x) is the number of chromosomes in one genome, i.e. one basic set. The haploid number (n) is the number of chromosomes in a gamete, which is half the somatic number.
Bread wheat (Triticum aestivum) is a hexaploid; its somatic cells contain six basic sets of chromosomes.
The basic number of wheat is x = 7.
Somatic chromosome number: 2n = 6x = 6 x 7 = 42.
Haploid (gametic) number: n = 42 / 2 = 21, which is equal to 3x.
So in hexaploid wheat n = 21 and x = 7.
Bread wheat (Triticum aestivum) is a hexaploid; its somatic cells contain six basic sets of chromosomes.
The basic number of wheat is x = 7.
Somatic chromosome number: 2n = 6x = 6 x 7 = 42.
Haploid (gametic) number: n = 42 / 2 = 21, which is equal to 3x.
So in hexaploid wheat n = 21 and x = 7.