Class 11 Biology - KARNATAKA
Cell Cycle and Cell Division
The chapter 'Cell Cycle and Cell Division' explores how a single cell grows, replicates its genetic material, and divides to form two daughter cells. For Karnataka (KSEEB) Class 11 students, mastering this chapter is essential as it forms the biological foundation for growth, repair, and reproduction in all living organisms. The chapter details the phases of the cell cycle—Interphase and M-phase—along with the intricate steps of Mitosis and Meiosis. Board exams frequently test conceptual differences between mitotic and meiotic divisions, significance of crossing over, and numerical problems based on DNA content and chromosome number during various phases.
Start Learning FreeKey Concepts
Cell Cycle
The sequential series of events by which a cell grows, replicates its genome, and divides into two daughter cells, divided into Interphase and M-phase.
Interphase
The preparatory phase of the cell cycle consisting of G1 phase (cell growth), S phase (DNA replication), and G2 phase (protein synthesis).
Mitosis
Equational division occurring in somatic cells where the chromosome number remains constant in the daughter cells, divided into prophase, metaphase, anaphase, and telophase.
Meiosis
Reductional division occurring in germ cells that reduces the chromosome number by half and introduces genetic variation through crossing over.
Synapsis and Crossing Over
Pairing of homologous chromosomes during the zygotene stage of Prophase I and exchange of genetic material between non-sister chromatids during pachytene.
Important Formulas
Board Exam Info
In the Karnataka (KSEEB) Class 11 Biology paper, this chapter typically carries around 6 to 8 marks. Questions usually include diagrammatic representations of mitotic/meiotic stages, differences between mitosis and meiosis, and short-answer questions on significance of crossing over.
Frequently Asked Questions
What is the difference between Interphase and M-phase?
Interphase is the resting or preparatory phase where the cell grows and replicates its DNA, whereas the M-phase (Mitosis/Meiosis) is the actual division phase where the nucleus and cytoplasm divide.
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 significance of crossing over?
Crossing over results in the recombination of genetic material between homologous chromosomes, which is responsible for genetic variations in sexually reproducing organisms.
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