Wheat (Triticum turgidum) and rye (Secale cereale) are allowed to bred to produce Triticale which expresses the most desirable characteristics of both species. Which one of the following is correct for the ploidy of the resulting hybrid which possesses four chromosome sets from the maternal wheat plant and two sets from the paternal rye plant?

Diploid (2n)

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Triploid (3n)

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Tetraploid (4n)

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Hexaploid (6n)

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Octoploid (8n)

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Solution

The correct option is D Hexaploid (6n)
The presence of two complete sets of chromosomes in organisms makes it diploid. Similarly, if the organism possesses 3, 4, 6, or 8 complete sets of chromosomes, it is said to be triploid, tetraploid, hexaploid or octaploid respectively. Since the hybrid is having 6 complete sets of chromosomes (four from wheat and two from rye), it is hexaploid.
Therefore, the correct answer is option D.

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