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Q.What would be the ploidy of the cells of the tetrad?

Sikkim CbseNCERTSubjectiveImportance★★★★★
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✓ Free question

Each of the four cells in a microspore tetrad is haploid (n), because the tetrad is the direct product of meiosis.

Section 1.2.1 already establishes the process this question is testing: microsporogenesis is the formation of microspores from a microspore mother cell (pollen mother cell, PMC) through meiosis. The key facts:

  1. The microspore mother cell is a diploid (2n) cell — it is a normal sporogenous-tissue cell, formed by ordinary mitotic divisions, so it carries the plant's full chromosome complement.
  2. This cell undergoes meiosis (meiosis I followed by meiosis II), which halves the chromosome number at meiosis I and does not restore it afterward.
  3. Meiosis of one diploid (2n) mother cell produces four haploid (n) daughter cells — the microspore tetrad — held together, at least initially, in a callose wall.

So every cell of the tetrad has exactly half the chromosome number of the microspore mother cell that produced it: haploid (n). This is the same haploid microspore that later develops into the pollen grain (the male gametophyte), consistent with the alternation-of-generations principle that the gametophytic generation is haploid.

✓Final answer

Haploid (n) — each tetrad cell has half the chromosome number of the diploid (2n) microspore mother cell, because the tetrad is formed by meiosis.

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