GENETICS

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					GENETICS
Genetic Diseases
                  GENETIC
                  DISEASES

       What is Down’s Syndrome?



Down’s syndrome is a form of mental
deficiency produced by a genetic
abnormality known as Trisomy21.
 Characteristics include a thick tongue,
extra eyelid folds, and short, stubby
fingers.
               THE CAUSE
                               During
                        Fertilization, half a
                        strand of male DNA
                        is shared with half a
                        strand of female
                        DNA

This will create the
full strand of DNA
needed for creating
a baby, however such
abnormalities such
as Trisomy21 causing
genetic diseases like
down’s syndrome in      Trisomy 21
babies.
    About down’s syndrome


•Down’s syndrome is named after the
doctor{John Langdon Down}who first
described the condition in 1866.
•On average, three babies are born with
Down’s syndrome each day in the UK{that’s
about one baby with Down’s syndrome for
every 1000 babies born in the UK}.
Why? By Chance
Down’s syndrome happens when at some point
during fertilisation or when the egg or sperm
was made an unusual cell division took place in an
extra copy of chromosome number 21 in all the
baby’s cells.
There is no real reason why this happens, it is all
merely chance!
     CREDITS



Eric Wong

Alfie kelly

Yussif Osman

Naser Qarri

Mohamed Sayed

Kerry Fallon

				
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posted:8/25/2011
language:English
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