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Pedigree Analysis
...
Consider a ñmily tree for cysüc fibrosis
...
2
...
Keg
O Female
There is a 0% chance of Mark and Caroline
having a child that will be a sufferer because
Mark
Caroline
Eve
Cgsticfibrosis
Phil
carriers
Neither carriers
Carolineis normal (FF)
3
...
00
new baby
Will
norsufferers
new babg
There is a 25% chance that Eve and Phil will
have a baby that is a sufferer, or a 50% chance
it will be a carrier or a 25% chance it will be normal
...
Many genetic disorders can be found by analysing cells genes
...
Family trees can help people to decide whether or not to be screened or have their unborn baby screened
...
Phil and Eve may decide to have their unborn baby screened because the are both carriers for
cystic fibrosis
...
The genetic pedigree diagram below shows the inheritance of sickle cell anaemia in one family
...
(2)
c)
c)
(1)
anaemia
...
boc lc L
GCSED=3marks
(2)
2
GCSE
5 marks
o
c