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Question #46987
The Question
In a typical Zygomycete fungus, the vegetative hyphae are haploid. If the DNA content of a single vegetative hyphal nucleus is denoted as 'x' and its chromosome number as 'n', what will be the chromosome number and DNA content per nucleus in the zygospore immediately after the S-phase prior to meiosis, and in the nuclei formed immediately after Meiosis I, respectively?
Options
- A.
Post S-phase: 2n, 2x ; Post Meiosis I: n, x
- B.
Post S-phase: 2n, 4x ; Post Meiosis I: n, 2x
- C.
Post S-phase: 4n, 4x ; Post Meiosis I: 2n, 2x
- D.
Post S-phase: 2n, 4x ; Post Meiosis I: n, x
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Bioreactor|Secondary_Metabolites|Plasmogamy
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The distinction between chromosome number (n) and DNA content (x) during the cell cycle, applied to a haploid-dominant organism.
Common Misconception: Students often equate 'haploid' (n) strictly with the base DNA content (x).
They fail to recognize that post-Meiosis I nuclei are haploid (n) but possess double the base DNA content (2x) because each chromosome still consists of two sister chromatids.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Fungal Sexual Lifecycle Stages |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |