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Mistakes in Meiosis. Nondisjunction. The failure of homologous chromosomes to separate properly during meiosis. Nondisjuction. Trisomy – extra chromosome (has 47) Ex: Down syndrome is Trisomy 21 Monosomy – missing a chromosme Usually does not survive (has 45). Triploid.

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nondisjunction
Nondisjunction
  • The failure of homologous chromosomes to separate properly during meiosis.
nondisjuction
Nondisjuction
  • Trisomy – extra chromosome (has 47)
    • Ex: Down syndrome is Trisomy 21
  • Monosomy – missing a chromosme
    • Usually does not survive (has 45)
triploid
Triploid
  • Has 3 sets of chromosomes
    • One gamete has 2 copies (diploid) and is fertilized by a gamete with the normal one copy (haploid)
tetraploid
Tetraploid
  • Has 4 sets of chromosomes
    • Both gametes have 2 copies (diploid) of each chromosome
    • Usually causes death in animals
    • Causes larger and healthier flowers and plants