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Slide 1

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Inheritance and Selection
lesson 4
· Where are chromosomes found?
· How many chromosomes are there in a
human body cell?
· What happens at fertilisation?
· Why does the fertilised egg not contain 92
chromosomes?…read more

Slide 2

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Cell Division
· A fertilised egg divides again and again.
· Every cell produced contain the same
number of chromosomes.
· Every cell contains the same genes.
· This kind of cell division is called mitosis.
· Almost every cell in a human contains
....... chromosomes.…read more

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Slide 4

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These cells have all been produced by mitosis
Mitosis is the type of cell division involved in:
· Growth and repair of tissues
·Asexual reproduction…read more

Slide 5

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These are sex cells (gametes)
They are produced by meiosis in sexual reproduction…read more

Slide 6

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Cell division 2
· When sex cells (eggs and sperm) are formed,
the number of chromosomes is halved.
· This involves a special type of cell division
called meiosis.
· Human sex cells contain ..... chromosomes.
· Meiosis produces cells which are all slightly
different ­ that is why brothers and sisters
from the same parents are not identical.…read more

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