Class 11 Biology - UP
Cell Cycle and Cell Division
The chapter 'Cell Cycle and Cell Division' in Class 11 Biology under the UPMSP curriculum explores the fundamental process by which a single cell divides to form daughter cells. Students will learn about the phases of the cell cycle, including Interphase and M-phase, and delve deeply into Mitosis (equational division) and Meiosis (reductional division). Understanding this chapter is crucial as it explains growth, tissue repair, and gametogenesis. In UPMSP board examinations, this is a high-scoring unit with questions frequently appearing on the differences between mitosis and meiosis, significance of crossing over, and phases of karyokinesis.
Start Learning FreeKey Concepts
Cell Cycle
The series of events by which a cell grows, replicates its genome, and divides into two daughter cells, broadly divided into Interphase and M-Phase.
Interphase
The preparatory phase of the cell cycle consisting of G1 phase (gap 1), S phase (synthesis), and G2 phase (gap 2), where DNA replication and protein synthesis occur.
Mitosis
Equational division occurring in somatic cells where the parent cell divides to form two genetically identical daughter cells with the same chromosome number.
Meiosis
Reductional division occurring in germ cells, reducing the chromosome number by half and producing four genetically distinct gametes through Meiosis I and Meiosis II.
Crossing Over
The exchange of genetic material between non-sister chromatids of homologous chromosomes during pachytene of Prophase I, leading to genetic variation.
Important Formulas
Board Exam Info
In the Uttar Pradesh (UPMSP) Class 11 Biology examination, this chapter typically carries around 6 to 8 marks. Questions usually include short-answer questions on phases of mitosis, long-answer questions detailing the stages of Meiosis I with diagrams, and distinction-based questions comparing mitosis and meiosis.
Frequently Asked Questions
Why is meiosis called reductional division?
Meiosis is called reductional division because the chromosome number is reduced to half in the daughter cells compared to the parent cell.
What happens during the S phase of interphase?
During the S phase (Synthesis phase), DNA replication takes place, meaning the amount of DNA per cell doubles while the chromosome number remains the same.
What is the significance of crossing over?
Crossing over results in the recombination of genetic material, which is the primary source of genetic variation in sexually reproducing organisms.
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