Class 11 Biology - ODISHA
Cell Cycle and Cell Division
The chapter 'Cell Cycle and Cell Division' in Class 11 Biology for Odisha BSE students explores how living organisms grow, repair, and reproduce at the cellular level. You will learn about the phases of the cell cycle—Interphase and M-phase—alongside detailed mechanisms of nuclear and cytoplasmic division: Mitosis, which maintains chromosome number in somatic cells, and Meiosis, which generates genetic diversity in germ cells. Understanding these processes is crucial for mastering genetics and physiology, and it frequently features in board exams through long-answer questions on mitotic and meiotic stages, making it a high-scoring area.
Start Learning FreeKey Concepts
Cell Cycle
The ordered series of events involving cell growth and division, comprising Interphase (G1, S, G2) and the M-phase.
Interphase
The resting or preparatory phase where the cell grows, replicates its DNA, and prepares for subsequent nuclear and cell division.
Mitosis
Equational division occurring in somatic cells, resulting in two genetically identical daughter cells with the same chromosome number as the parent.
Meiosis
Reductional division occurring in germ cells, producing four genetically different haploid daughter cells essential for sexual reproduction.
Crossing Over
The exchange of genetic material between non-sister chromatids of homologous chromosomes during pachytene of Meiosis I, creating genetic variation.
Important Formulas
Board Exam Info
In the Odisha BSE Class 11 Biology examinations, this chapter typically carries around 6 to 8 marks. Questions often include short-answer questions on specific phases like Prophase or Anaphase, differences between mitosis and meiosis, and long-answer descriptive questions outlining the stages of Meiosis I with diagrams.
Frequently Asked Questions
What is the difference between mitosis and meiosis?
Mitosis is equational division producing two identical diploid cells for growth and repair, whereas meiosis is reductional division producing four genetically varied haploid cells for reproduction.
Why is interphase called the resting phase?
It is a misnomer; although the cell is not dividing, interphase is a period of intense metabolic activity where the cell grows and duplicates its DNA.
When does crossing over take place during meiosis?
Crossing over occurs during the pachytene stage of Prophase I in Meiosis I, mediated by the enzyme recombinase.
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