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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