MEIOSIS

 

Comparison of Asexual and Sexual Reproduction

       Sexual

              Body cells: diploid, 2 sets

              Gametes: haploid, 1 set

       Asexual

              Binary fission, budding, regeneration

              Identical

How Meiosis Halves the Chromosome Number

       Homologues

       Two divisions, rather than one

Key Events of Meiosis I

       Prophase I

              Crossing over

              Genetic Variability

       Metaphase I alignments

       Anaphase I

       Telophase I

       Meiosis II:  PMAT

Gamete formation

       In plants:  Alternation of Generations

       In animals:  Oogenesis

Meiosis vs. Mitosis

       2x stages, 1/2 chromosomes, crossing over -->                                                           genetic variability