03 Meiosis

  • meiosis very drawn out in female = prone to error

  • 1 set w/ no chromosomes
  • 2nd set w/ 2 chromosomes, 2n, not 1n, 1 copy from father, 1 copy from mother, different from Meiosis 2

  • no mixture genes. Only from either mom or dad

  • advanced age, longer through meiosis

  • ACD: error in mother. CD homologous nondisjunction

  • rare
  • abnormal gametes from both male and female

  • usually normal, unless recessive disease

  • acrocentric: centromeres near end, short arm
  • long arms link up, both short arms lost
  • usually not big deal, lost genes only little, but can give 14:21 to offspring

  • father: always normal chromosome
  • mother: many possibilities
  • mother donate normal: normal
  • mother donate 14:21: carrier
  • monosomy and trisomy 14 not viable
  • many failed pregnancies and spontaneous abortion