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Principles of Inheritance and Variation question

2007 · Q60
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Principles of Inheritance and Variation question

2007 · Q60

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
In the hexaploid wheat, the haploid(n) and basic(x) numbers of chromosomes are :
  1. A
    n = 21 and x = 14
  2. B
    n = 21 and x = 21
  3. C
    n = 7 and x = 21
  4. D
    n = 21 and x = 7
View written solutionFree

Correct answer: D

Hexaploid wheat has six sets of homologous chromosomes. In botanical nomenclature, the term "haploid" (n) refers to the number of unique chromosomes in a gamete, which in the case of hexaploid wheat is 21. The "basic" number (x) is the number of chromosomes in a single set within the organism, which in hexaploid wheat is 7, as there are six such sets (6x = 42 total chromosomes in a somatic cell).

Therefore, the correct answer is :

Option D : n = 21 and x = 7.

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