Class 11 Biology - HARYANA
Cell Cycle and Cell Division
The chapter 'Cell Cycle and Cell Division' in Class 11 Biology covers the fundamental process by which a single cell divides to form daughter cells, ensuring growth, repair, and reproduction in living organisms. Students will explore the phases of the cell cycle, specifically Interphase and M-phase, alongside detailed steps of mitosis and meiosis. Understanding these mechanisms is crucial for Haryana (BSEH) board exams, as examiners frequently test students on the differences between mitotic and meiotic divisions, the significance of crossing over in meiosis, and identifying various stages through diagrams.
Start Learning FreeKey Concepts
Cell Cycle
The ordered series of events involving cell growth and division, comprising Interphase (G1, S, G2 phases) and the M-phase (Mitosis/Meiosis).
Mitosis
Equational division resulting in two genetically identical daughter cells with the same chromosome number as the parent cell, essential for growth and repair.
Meiosis
Reductional division occurring in germ cells, producing four haploid daughter cells and introducing genetic variation via crossing over during Prophase I.
Synapsis and Crossing Over
The pairing of homologous chromosomes during Zygotene and the exchange of genetic material between non-sister chromatids during Pachytene of Meiosis I.
G0 Phase (Quiescent Stage)
A state where cells exit the active cell cycle and remain metabolically active without dividing, unless called upon to do so depending on organismal needs.
Important Formulas
Board Exam Info
In the Haryana (BSEH) Class 11 Biology board examinations, this chapter typically carries around 5 to 7 marks. Common question types include short-answer questions differentiating mitosis and meiosis, essay-type questions detailing the sub-stages of Prophase I, and diagram-based identification questions.
Frequently Asked Questions
Why is meiosis called reductional division?
Meiosis is called reductional division because the chromosome number is halved from diploid (2n) to haploid (n) in the daughter cells.
What is the main difference between cytokinesis in plant and animal cells?
In animal cells, cytokinesis occurs by furrowing/cleavage of the cell membrane, whereas in plant cells, it occurs by the formation of a cell plate from the center outwards.
Why does DNA replication happen in Interphase?
DNA replication occurs specifically during the S-phase of Interphase to ensure that each daughter cell receives an identical and complete set of genetic material during division.
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