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Genes and DNA

Genes and DNA. DNA. Deoxyribonucleic acid Chromosomes are made of DNA Made of nucleotides. DNA Shape. Double helix (twisted ladder). Nucleotides. Made of : Sugar (ribose) Phosphate Base . The 4 bases. Adenine (A) Thymine (T) Guanine (G) Cytosine (C). The pairing of bases.

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Genes and DNA

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  1. Genes and DNA

  2. DNA • Deoxyribonucleic acid • Chromosomes are made of DNA • Made of nucleotides

  3. DNA Shape • Double helix (twisted ladder)

  4. Nucleotides • Made of : • Sugar (ribose) • Phosphate • Base

  5. The 4 bases • Adenine (A) • Thymine (T) • Guanine (G) • Cytosine (C)

  6. The pairing of bases • A pairs with T (A-T) • C pairs with G (C-G)

  7. Double Helix • Sides of ladder made of sugar and phosphates (pg 82) • Rungs made of base pairs

  8. Rosalind Franklin

  9. Watson and Crick

  10. Incomplete Dominance • Each allele has a degree of influence • Red snapdragon x White snapdragon = • Pink Snapdragon

  11. Sometimes one gene can influence many traits • Example : • White tiger’s eyes

  12. Sometimes many genes can influence a single trait • Example: • Eye Color

  13. Copies of DNA • Each side is complementary to the other • ACCTAGTTG ? • TGGATCAAC

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