01 Meiosis

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01 Meiosis

  1. 1. Meiosis • Chromosomes • Nuclear envelope • Cell membrane • Centrioles ALBIO9700/2006JK
  2. 2. • Involves 2 divisions: i) Meiosis I – reduction division (resulting in 2 daughter nuclei with half the number of chromosomes of the parent nucleus ii) Meiosis II – chromosomes behave as in mitosis (each of the 2 haploid daughter nuclei divides, resulting in a total of 4 haploid nuclei) ALBIO9700/2006JK
  3. 3. Centrioles? Prophase I Nuclear envelope? Nucleolus? SynapsisMetaphase I *bivalentProphase II Anaphase I Telophase IMetaphase II Cytokinesis? Anaphase II Telophase II ALBIO9700/2006JK
  4. 4. Variation• Crossing over• Independent assortment of homologous chromosome• Fertilisation ALBIO9700/2006JK
  5. 5. • Locus• Alleles• Dominant• Recessive• Codominant• Homozygous• Heterozygous• Phenotype• Genotype ALBIO9700/2006JK
  6. 6. • Locus• Alleles• Dominant• Recessive• Codominant• Homozygous• Heterozygous• Phenotype• Genotype ALBIO9700/2006JK

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