Lesson 10: Cell division-mitosis and meiosis

Hi,

This is a very good revision material to view. concepts covered include:

• cells divide to increase numbers for growth, repair and reproduction
  
• cell organelles-mitochondria, chloroplast, nucleus, cell membrane
• specialised cells-red blood cell, nerve cell, pollen, guard cell, palisade cell, xylem cell,
• 1 billion cells per hour are replaced in your body by cell division
• blood cells by bone marrow by mitosis
  
• skin cells 100 million per day by mitosis
  
• zygote, 1 cell, grows into baby within 9 months by mitosis
• photographs on mitosis in onion shoot and root tip showing mitosis
• meiosis- in testis, ovary, anther
• fertilisation restores the diploid number in zygote
• mitosis ( 2n--> 4n--> 2n-->2n)
• meiosis (2n--> 4n-->2n-->n)
  
• the sex of child is determined at the point of fertilisation
• fertilisation with y-carrying sperm results in male, fertilisation with x-carrying sperm results in female child.
• meiosis occurs in anther producing pollen, in testis producing sperm, in ovary producing ova, ( or ovule in plant).
  
• self fertilisation less variation than cross fertilisation in plants
• short questions
  

Mitosis and Meiosis

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Cheers