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Where do our genes come from?
From our parents
Mother
egg from
mother
2 copies
of DNA in
each cell
nucleus containing
1 copy of mother’s DNA
Child
Father
sperm from
father
nucleus containing
1 copy of father’s DNA
2 copies
of DNA in
each cell
Cell divides
Fertilised
egg
DNA from both
parents
Each cell has a
complete set of DNA
nucleus containing
complete set of DNA
(set=2 copies, 1 copy
from each parent)
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