General Biology I - Meiosis - Reduction Division PDF

General Biology I MEIOSI S (The Reduction Division) Ma’am Jo Abejero OBJECTIVES: 1 Differentiate the Mitosis to Meiosis. Identify the important key 2 information from the reduction division (Meiosis). Master and Explain the events 3...

General Biology I MEIOSI S (The Reduction Division) Ma’am Jo Abejero OBJECTIVES: 1 Differentiate the Mitosis to Meiosis. Identify the important key 2 information from the reduction division (Meiosis). Master and Explain the events 3 that are happening in each stages of Meiosis I and Meiosis II.  T h i n g s To Re In Cell Cycle wemhave e mto b eremember r: these important key terms you’ll encounter: Diploid (2n)- Two sets of chromosomes, usually one from the mother and one from the father;. Haploid (1n)- It has a single set of chromosomes;. “n” represents to chromosomes. Homologous Chromosomes pertains to one of a pair of chromosomes with the same gene sequence, chromosomal  MITOSIS | M E I O S I S : Mitosis is simply the division of somatic cells or body cells that make up most of the body. Mitosis produces two identical daughter cells. two (2n).  While the Meiosis is the division of gametes or sex cells.  Meiosis produces four genetically diverse daughter cells. Four (1n) M E I O S I S ( Re d u c t i o n D iMEIOSIS v i s i o n(Reduction ): Division) - It is a special type of cell division that produces gametes (Sex Cells: Sperm & Egg), specialized cells whose chromosome number is half that of other body cells. This process changes diploid cells with their two sets of chromosomes to haploid cells with just one set of chromosomes. It occurs through two consecutive cell divisions called meiosis I and meiosis II. MEIOSI S I MEIOSI S I Prophase I- The homologous chromosomes of sister chromatids lie side by side- this process is called SYNAPSIS and form a Tetrads. The crossing over will occur. During crossing over the physical exchange occur between chromosomes segments (alleles).  MEIOSI S I Prophase I- The homologous chromosomes of sister chromatids lie side by side- this Allele process is called SYNAPSIS and form a Tetrads. The crossing over s will occur. During crossing over the physical exchange occur between chromosomes segments (alleles). MEIOSI S I Prophase I- The homologous chromosomes of sister chromatids lie side by side- this process is called SYNAPSIS and form a Tetrads. The crossing over will occur. During crossing over the physical exchange occur between chromosomes segments (alleles).  MEIOSI Metaphase I - S I The spindle fibers attach to the chromatids near the centrioles. The spindle fibers move the tetrads at the equator plate of cells. MEIOSI S I Anaphase I - The homologous chromosomes separate and move to the opposite poles of the cell.  MEIOSI Telophase I- The S I chromosomes condenses and the nuclear envelope appears and, then; Cytokinesis I - separates the cytoplasm and produces 2 haploid cells. MEIOSIS II MEIOSIS II Interkinesis – Where the two haploid cell has a rest and preparing for prophase II. Prophase II- The centrioles radiate spindle fibers as they move to opposite sides of the cell.  MEIOSIS II Metaphase II- Chromosomes line up along the plane in the center of the cell. MEIOSIS II Anaphase II- The pairs of chromatids are pulled apart, each moving towards the opposite end of the cell.  MEIOSIS Telophase II- II Chromosomes arrived at the pole of the cell and decondense. Cleavage furrow divides the two cells into four haploid cells. Cytokinesis II- produces four different daughter cells. T h a n k Yo u f o r Listening 