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Genetics
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DNA is found in the nucleus!
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DNADeoxyribonucleic Acid
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Structure of DNA
Double-Helix shape (Spiral Ladder)
The sides are made of sugar (deoxyribose)
“-ose” means sugar
The rungs are made of 4 different kinds of nitrogen bases.
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A bonds with TG bonds with C
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What matches with…
AAATTTGGGCCC?
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What matches with…
AAATTTGGGCCCTTTAAACCCGGG
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James Watson and Francis Crick
• Two scientists credited for discovering DNA
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The helix shape was actually discovered by a woman,
Rosalind Franklin.
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Chromosome
Is coiled up DNA
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Like coiled up yarn
Chromosome
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AAATTTGGGCCC
TTTAAACCCGGG
DNA Strand
Chromosome
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ChromosomesCome in pairs!
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Chromosome
Pair
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DadMom
Why Pairs?
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23 Kinds of Chromosomes
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23 pairs of Chromosomes
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46 Chromosomes total
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True or False: Chromosomes in every nucleus in the body are identical.
True!Eachnucleushasanidenticalsetofchromosomes.
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Smallest structural and functional unit of an organism
Central Organelle Coiled DNA
Carrier of genetic information
Individual bases that pair up to cause genes
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