BIO152H5 Lecture Notes - Lecture 5: Sexual Reproduction, Spindle Apparatus, Nuclear Membrane

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19 May 2017
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Chromosomes & meiosis: there are 23 types of chromosomes and 2 chromosomes of each type, homologous chromosomes: one from each parent, x & y are sex chromosomes, humans: 2n=46. Why: meiosis, sexual reproduction: involves the alternation of meiosis & fertilization. Major events in meiosis: each chromosome replicates prior to undergoing meiosis, b) during meiosis, chromosome number in each cell is reduced, four daughter cells contain one chromosome each, a full complement of chromosomes is restored during fertilization. When do meiosis & fertilization occur during the life of an organism: multicellular diploid-> meiosis, haploid spores break into half, alternation generation occurs here -> haploid gamete, more complex than life cycle in animals. Phases of meiosis: has two divisions meiosis i & meiosis ii, meiosis i is a continuous process. Interphase: chromosomes replicate in parent cell, in uncondensed state (look in lec, prophase (early & late prophase, early prophase i: chromosomes condense, nuclear envelope breaks up, spindle apparatus forms.

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