Summary Human DNA notes

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Summary Human DNA notes

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Grade 12 notes on human DNA - according to 2024 IEB sags

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DNA: THE CODE OF LIFE

DEOXYRIBOSE NUCLEIC ACID

LOCATION
: found on chromosomes in the nucleus
: in the mitochondria
: in plastids (e.g chloroplasts)

CHROMOSOMES
Found in the nucleus

 Nucleus controls cell activities
 Contains genetic code

Nucleus contains chromatin
Thin threads of DNA

DNA winds up into chromosomes

DNA is protected by
proteins called HISTONES

GENES
A small piece of DNA that codes for a particular protein

Locus: location of a gene on a chromosome

CHROMOSOME

, EXTRANUCLEAR DNA
: found outside the nucleus
: mitochondria
: plastids

DISCOVERY OF THE STRUCTURE OF DNA

DNA first isolated
Friedrich Miescher
1869

 American scientist
James Watson
 British scientist
Francis Crick

Examining structure of DNA (discovered it
showed x-shape)
1951
 British scientists
Maurice Wilkens
Rosalind Franklin

First to get good x-ray photo of DNA fibers
Described DNA as long & thin

1953

Describe double helix
shape

1962 WATSON
CRICK
WILKENS
Awarded Noble Prize for
medicine

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Schooljaar: 202
Uploaded on: February 16, 2025
Number of pages: 11
Written in: 2024/2025
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