MEIOSIS

• MEIOSIS:

  • Takes place in REPRODUCTIVE organs (testes, OVARIES)
• GAMETES:

  • SPERM and EGG cells
  • Have SINGLE CHROMOSOMES
• STEP 1:

  • CHROMOSOMES are COPIED
• STEP 2:


  • Cell DIVIDES into 2
• STEP 3:

  • Cell DIVIDES once more
  • 4 GAMETES are formed from the ORIGINAL cell (SINGLE, not PAIRED chromosomes, genetically DIFFERENT)
• SEXUAL REPRODUCTION:


  • GAMETES join by FERTILISATION
  • Cell- gets the NORMAL number of CHROMOSOMES
  • This cell DIVIDES by MITOSIS forming a CLONE of IDENTICAL cells called an EMBRYO
  • This EMBRYO can develop so cells DIFFERENCIATE