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9. Dna
Dna kemiallisesti

•  Nukleiinihappo
•  Kaksi juostetta
•  Muodostaa kaksoiskierteen
•  Koostuu nukleotideistä
    •  Sokeri
    •  Fosfaatti
    •  Emäs
•  Emäkset sitoutuneet
   toisiinsa vetysidoksin
Dna
Kromosomit

•  Koostuvat dna:sta ja
   proteiineista
  •    Muodostavat kromatiinia
•  Kromatiini mahdollistaa
   tiukemman pakkauksen
•  Sentromeeri jakaa
   kromosomin kahteen
   käsivarteen.
•  Kromosomin päissä
   telomeerit.
Geeni

•  Jakso dna:ta
•  Ohjaa proteiinin tai rna:n
   muodostumista
•  Ihmisellä 23 000 46
   kromosomissa.
Alleeli

•  Geenin vaihtoehtoinen
   muoto.
•  Kaksi samaa alleelia =
   homotsygoottinen eli
   samaperintäinen
•  Kaksi eri alleelia =
   heterotsygoottinen eli
   eriperintäinen

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