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Genetics and 7
GCSE Biology…read more

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DNA stands for deoxyribose nucleic acid
DNA carries the genetic code that controls our
Except for identical twins, every humans DNA is
DNA is formed into chromosomes
DNA is in the shape of a double helix
It is made up of base molecules connected to
each other…read more

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A cell's nucleus contains 23 pairs of
This means they have 46 each (except gametes,
which have 23, half the number)
A chromosome is made up of two chromatids
joined together
Chromosomes are made up of DNA…read more

Slide 5

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Chromosomes…read more

Slide 6

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These make up the actual genetic code of DNA
The order of the bases varies, and it is this that
makes us different
There are four different types of bases:
Adenine, Cytosine, Guanine, and Thymine
Adenine (A) and Thymine (T) always join
Cytosine (C) and Guanine (G) always join
together…read more

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