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NEET2006ZoologyPrinciples of Inheritance and VariationActual

In which one of the following combinations (a-d) of the number of chromosomes is the present day hexaploid wheat correctly represented?

Options

  1. A(a)
  2. B(b)
  3. C(c)
  4. D(d)

Correct answer

D. (d)

Step-by-step solution

The present day wheat is hexaploid, known as triticale (2 n=42) with 3 genomes A, B and D i.e, AABBDD . The 3 genomes are obtained from 3 different diploid species. (i) Triticum aegilopoides - AA (2 n =14) (ii) Aegilops speltoides - BB (2 n =14) (iii) Aegilops squarossa - DD (2 n =14) By crossing of first two diploids sps Triticum dicoccoides (2 n=28) i.e., tetraploid is produced AABB which on crossing with third species gives rise to Triticum aestivum (2 n =42) hexaploid (AABBDD). So its haploid set will have 21 c

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