Class 11 Biology - RAJASTHAN
Cell Cycle and Cell Division
The chapter 'Cell Cycle and Cell Division' in RBSE Class 11 Biology explores how a single cell divides to form new cells, which is fundamental for growth, repair, and reproduction in living organisms. Students will study the phases of the cell cycle—Interphase and M-phase—along with detailed steps of Mitosis and Meiosis. Understanding these processes is crucial for board exams as it forms the basis of genetics and cellular biology, frequently featuring in both objective and long-answer questions.
Start Learning FreeKey Concepts
Cell Cycle
The series of events that take place in a cell leading to its division and duplication of its DNA, divided mainly into Interphase and M-Phase.
Interphase
The resting or preparatory phase where the cell grows, replicates its DNA, and prepares for nuclear division, consisting of G1, S, and G2 phases.
Mitosis
Equational division where a parent cell divides to produce two identical daughter cells with the same number of chromosomes, essential for growth and repair.
Meiosis
Reductional division occurring in germ cells that reduces the chromosome number by half, producing four genetically diverse haploid gametes.
Crossing Over
The exchange of genetic material between non-sister chromatids of homologous chromosomes during pachytene of meiosis I, leading to genetic variation.
Important Formulas
Board Exam Info
In the Rajasthan (RBSE) Class 11 Biology board examinations, this chapter typically carries around 5 to 7 marks. Questions commonly include diagrams of cell division stages (Mitosis and Meiosis), differences between mitosis and meiosis, and conceptual questions on crossing over and the significance of the cell cycle.
Frequently Asked Questions
What is the difference between mitosis and meiosis?
Mitosis is equational division producing two identical diploid cells for growth, while meiosis is reductional division producing four genetically different haploid cells for sexual reproduction.
Why is interphase called the resting phase?
It is called a resting phase because there is no visible cell division happening, but metabolically it is the most active phase where the cell prepares by replicating DNA and synthesizing proteins.
When does crossing over take place?
Crossing over occurs during the pachytene stage of Prophase I in Meiosis I between non-sister chromatids of homologous chromosomes.
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