The given graph depicts the changes in the amount of DNA per nucleus during cell cycle.The labelled region X represents:
Correct answer: B. Meiosis
- A. Mitosis
- B. Meiosis
- C. S-phase
- D. G2 phase
Explanation
The correct answer is meiosis. Meiosis is characterized by two sequential divisions, meiosis I and meiosis II, which result in a reduction of chromosome number by half. This process is reflected in the graph as a decrease in the amount of DNA per nucleus. In contrast, mitosis results in two daughter cells with the same amount of DNA as the parent cell, so the DNA content per nucleus does not decrease. During the S-phase, DNA replication causes an increase in the DNA content, not a decrease. In the G2 phase, the DNA content is stable following replication in the S-phase, and no reduction occurs until mitosis.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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