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Meiosis Notes Name ____________________ Period ____ Date ___________ Meiosis Meiosis occurs in __________ reproduction when a ________ germ cell produces ___ ___________ daughter cells that can mature to become ____________(_______ or _____). Goal: ________ genetic material by ______ Why? n (mom) + n (dad) = ___n (_____________) Fertilization Chromosomes Meiosis I Prophase I Chromatids ________ and __________. ____________over occurs. __________ forms. Nuclear _____________fragments. 1 of 4 Metaphase I Chromatid pairs _______ along the __________ of the cell. Anaphase I Chromosomes ____________and move to ___________ poles. Sister chromatids remain _____________ at their _________________. Telophase I Nuclear envelopes ____________. __________ disappears. ____________ divides cell into ____. Meiosis II ________ chromatids carry ____________ genetic information. Meiosis II produces ____________ with ___copy of each _____________ and thus one copy of each______. Prophase II Nuclear envelope ______________. Spindle _________. Metaphase II Chromosomes _______ along __________ of cell. 2 of 4 Anaphase II Sister ___________ separate and move to opposite _______. Telophase II Nuclear envelope _______________. Chromosomes _________. Spindle ____________. ________________ divides cell into ______. Results of Meiosis _____ _________ cells One ______ of each chromosome ____________ allows the creation of ________ individuals through __________ reproduction. Meiosis keeps _______________________________________________________________________ 3 of 4 Comparison of Mitosis & Meiosis Mitosis Meiosis Number of divisions Number of daughter cells Genetically identical? Chromosome # Where When Role MITOSIS MEIOSIS Occurs in ________(body) cells Occurs only in ________ (sex organs: ________/_________) Produces cells for_________, maintenance, _________, asexual reproduction Only produces ___________ (sex cells: ______/________) Results in _________diploid (2n) daughter cells Reduction division results in __________(n) cells Mistakes in Meiosis _____________________= The failure of homologous chromosomes to separate properly during meiosis _____________: When a gamete with ___________ chromosomes is fertilized by a normal gamete, the zygote will have an extra chromosome _____________ = When a gamete that is _______________ a chromosome fuses with a normal gamete during fertilization, the resulting zygote lacks a chromosome. _____________________ = organisms with more than the usual number of chromosomes sets 4 of 4