POLYPLOIDY

• WHAT IS POLYPLOIDY?

  changes in whole sets of chromosomes
• WHEN DOES POLYPLOIDY OCCUR?

  when organisms have 3+ chromosome sets
• WHERE DOES POLYPLOIDY MAINLY OCCUR?

  plants
• EXAMPLE OF NON-DISJUNCTION (IN MEIOSIS I)?

  1. Each homologous pair is doubled due to DNA replication in interphase
  2. Non-disjunction in meiosis I
  3. All chromosomes fail to separate equally
  4. Normal division in meiosis II
  5. Chromatids separate equally
  6. Creating two diploid gametes and two gametes with no chromosomes
• EXAMPLE OF NON-DISJUNCTION (IN MEIOSIS II)?

  1. Each homologous pair doubled due to DNA replication in interphase
  2. Normal division in meiosis I
  3. Chromosomes separate equally
  4. Normal meiosis II in one cell
  5. Creating two haploid gametes
  6. Non-disjunction in meiosis II in other cell
  7. All chromatids fail to separate equally
  8. Creating one diploid gamete and one gamete with no chromosomes