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Ascus normally contains how many numbers of ascospores?
Question

Ascus normally contains how many numbers of ascospores?

A.

8

B.

16

C.

4

D.

None of the above

Correct option is A

The correct answer is: (A) 8
Explanation:
An ascus is a sac-like structure found in Ascomycota fungi that contains ascospores (reproductive spores). Normally, an ascus produces 8 ascospores as a result of meiosis followed by mitosis:
  • A diploid nucleus (2n) undergoes meiosis, forming 4 haploid nuclei.

  • Each of these 4 haploid nuclei undergoes mitotic division, resulting in 8 ascospores inside the ascus.

  • This is a characteristic feature of sac fungi (Ascomycetes), such as yeast, Penicillium, and Aspergillus.

Information Booster:
  • The number of ascospores in an ascus can vary but is most commonly 8.

  • Examples of Ascomycetes fungi: Yeast (Saccharomyces cerevisiae), Morels (Morchella), Truffles (Tuber), and Neurospora (Neurospora crassa).

  • The ascus is a defining feature of Ascomycota fungi, making them distinct from other fungal groups like Basidiomycota (mushrooms).

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