Biology: Cell Cycle and Cell Division Past Paper PDF

🐾 Biology: Cell cycle and cell division Pastpp review Notes Chromosome Only interphase (dividing) can see→uncoil→chromatin Count the number by centromere homologous chromosomes(same lengt...

🐾 Biology: Cell cycle and cell division Pastpp review Notes Chromosome Only interphase (dividing) can see→uncoil→chromatin Count the number by centromere homologous chromosomes(same length) Biology: Cell cycle and cell division Pastpp review 1  Cell cycle Interphase Synthesis of proteins Synthesis of new organelles Biology: Cell cycle and cell division Pastpp review 2  Replication of DNA end→doubled dna Mitosis genetically identical daughter cells Cytokinesis in animals Cell membrane moves inwards Constricts to form a cleavage furrow Cytokinesis in plant Biology: Cell cycle and cell division Pastpp review 3  Cell plate grows outwards Significance of mitosis Growth and repair of cells Asexual reproduction Meiosis Significance Of meiosis Sexual reproduction Biology: Cell cycle and cell division Pastpp review 4  haploid fuses to keeps constant diploid number of chromosomes independent assortment of homologous chromosomes In metaphase one crossing over In prophase one mitosis vs meiosis Reminder Crossing over Exchange of genetic materials between non sister chromatids First vs second meiotic cell division First: separation of homologous chromosomes Second: separation of sister chromatids Biology: Cell cycle and cell division Pastpp review 5  Preservation of genetic materials in mitosis DNA is duplicated right before mitosis The duplicated chromosomes will line up at the middle part of cell for separation Each member of duplicated chromosomes will separated and divide equally into each daughter cell Time for transcription When genetic materials are loosely packed Interphase: invisible chromosomes Meiosis has doubled daughter cells Twice cell divisions Meiosis has halved chromosomes Only meiosis has homologous chromosomes pairing up Biology: Cell cycle and cell division Pastpp review 6