Cell Cycle
Note on Cell Cycle and Division
Page 1: Prayer
Entrustment to Virgin Mary
A prayer expressing devotion and seeking guidance for individuals, families, and communities.
Page 3: Lesson Objectives
Characterization of Cell Cycle Phases
Comparison of Mitosis and Meiosis
Description of Stages in Mitosis/Meiosis
Significance of Mitosis/Meiosis
Page 6: Overview of Cell Cycle
Key Feature of Life
Understanding cell reproduction is essential for grasping biological processes.
Stages of Cell Cycle
Focus on mitosis and meiosis and their significance for organisms.
Page 7: Introduction to Cell Cycle
Reproduction in Living Things
Cells undergo cycles for growth and repair.
Purpose of Cell Cycle
Enables organisms to multiply systematically.
Page 8: Definition of Cell Cycle
Ordered Series of Events
Involves cell growth and division to produce two daughter cells.
Regulated Stages
Includes growth, DNA replication, and division.
Page 10: Interphase
Normal Growth Processes
Prepares the cell for division.
Conditions for Mitosis
Internal and external conditions must be met for transition to mitotic phase.
Page 11: Phases of Interphase
G1 Phase: Cell Growth
S Phase: DNA Synthesis
G2 Phase: Preparation for Mitosis
Page 12: G1 Phase
Biochemical Activity
Accumulation of DNA building blocks and energy reserves.
Page 13: S Phase
DNA Replication
Formation of identical DNA pairs (sister chromatids).
Centrosome Duplication
Essential for mitotic spindle formation.
Page 15: G2 Phase
Energy Replenishment
Synthesis of proteins for chromosome manipulation.
Final Preparations for Mitosis
Page 16: Mitotic Phase
Multistep Process
Alignment, separation, and movement of chromosomes to form two identical daughter cells.
Page 19: Prophase
Chromosome Condensation
Chromosomes become visible; nuclear envelope disappears.
Page 20: Metaphase
Microtubule Dynamics
Astral, polar, and kinetochore microtubules play roles in chromosome alignment.
Page 21: Anaphase
Chromatid Separation
Kinetochore microtubules pull sister chromatids apart.
Page 22: Telophase
Chromosome Uncoiling
Reappearance of nuclear envelope and nucleolus; cytokinesis begins.
Page 25: Importance of Mitosis
Chromosome Number Maintenance
Daughter cells retain the same chromosome number as the parent cell.
Cell Replacement
Mitosis aids in healing wounds and tissue regeneration.
Page 35: Meiosis Overview
Reduction of Chromosome Number
Diploid cells reduce to haploid cells for gamete formation.
Page 36: Meiosis Divisions
Meiosis I: Reductional Division
Meiosis II: Equational Division
Page 40: Prophase I Stages
Leptotene to Diakinesis
Chromosome condensation, synapsis, and crossing-over occur, increasing genetic variation.
Page 42: Metaphase I
Homologous Chromosomes Alignment
Chromosomes align at the metaphase plate.
Page 44: Telophase I
Chromosome Separation
Resulting cells have half the chromosome number.
Page 46: Meiosis II
Similar to Mitosis
Daughter cells produced have half the genetic material.
Page 54: Telophase II
Final Stages
Chromosomes uncoil, and nuclear structures reappear.
Page 58: Mitosis vs. Meiosis
Comparison of Processes
Different outcomes in chromosome number and genetic variation.
Page 60: Questions
Encouragement for Inquiry
Open floor for questions regarding