03 Meiosis

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• 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