Class 11 Biology - GUJARAT
Cell Cycle and Cell Division
The chapter 'Cell Cycle and Cell Division' in GSEB Class 11 Biology explores how a single cell grows, replicates its genetic material, and divides to form daughter cells. It covers the phases of the cell cycle—Interphase and M-phase—along with detailed mechanisms of Mitosis and Meiosis. Students will learn about the significance of equational and reductional division in growth, repair, and sexual reproduction. For Gujarat board exams, this chapter holds high weightage, frequently featuring conceptual questions on chromosome behavior during various stages, differences between mitosis and meiosis, and the importance of crossing over.
Start Learning FreeKey Concepts
Cell Cycle
The series of events by which a cell grows, duplicates its DNA, and divides into two daughter cells, consisting of Interphase and M-Phase.
Interphase
The preparatory phase of the cell cycle divided into G1 (Gap 1), S (Synthesis), and G2 (Gap 2) phases where the cell grows and replicates its DNA.
Mitosis
Equational cell division occurring in somatic cells, resulting in two genetically identical daughter cells through Prophase, Metaphase, Anaphase, and Telophase.
Meiosis
Reductional cell division occurring in germ cells that reduces the chromosome number by half, producing four genetically different 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
This chapter typically carries around 4 to 6 marks in the Gujarat (GSEB) Class 11 Biology board examinations. Questions commonly include distinguishing between mitosis and meiosis, explaining the sub-stages of prophase I of meiosis, and numerical problems related to cell division cycles.
Frequently Asked Questions
What is the difference between mitosis and meiosis?
Mitosis is equational division producing two identical diploid cells for growth and repair, while meiosis is reductional division producing four haploid gametes for sexual reproduction.
Why is Interphase called the resting phase?
It is historically called the resting phase because there is no visible division, but metabolically it is the most active phase where the cell grows and duplicates its DNA.
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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