BIOL 1010U Lecture Notes - Lecture 11: Sarcoma, Protein Kinase, P53
Document Summary
Cell division (meiosis) and cell cycle lecture (part 2) - Includes two rounds of nuclear division - meiosis i and meiosis ii. Which types of cells are produced by meiosis: compare to mitosis gametes. Characteristics of daughter cells: each cell contains half the number of chromosomes as the parent, each cell is genetically unique. Meiosis i: dna replication takes place before prophase i (same as mitosis) Dna exchange between maternal and paternal chromosomes. Homologous chromosomes separate; centromeres do not split. Reductional division from diploid to haploid. Note: there is no dna synthesis between meiosis i and meiosis ii! End result of meiosis: four haploid cells, genetically different than parent cell. Cytoplasmic division: in meiotic division, division of the cytoplasm differs between males and females. Reproduction: sexual reproduction involves, meiotic cell division, occurs in ovaries and testes, produces haploid gametes (sperm and eggs)