Biological information is transmitted by inheritance

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Biological information is transmitted by inheritance Milkweed seeds Budding of yeast cells: GFEgB_ytDZY?t=51 Cute puppies Saccharomyces cerevisiae “brewer’s yeast” Offspring are (more or less) like their parents
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DNA is the molecule of inheritance 1.6 Genetics can be subdivided into three interrelated fields. [Top left: Junior’s Bildarchiv/Alamy. Top right: Mona file M0214602tif. Bottom: J. Alcock/Visuals Unlimited.] DNA = deoxyribonucleic acid Stores and transmits information
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Genes are the unit of heredity Genes code for inherited traits The gene is a section of DNA Only some of an organism’s DNA is genes Gene
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Karyotype set of human chromosomes Disrupted E. coli cell Genome = All the DNA in an organism
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DNA is a double helix Watson and Crick 1953
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DNA polynucleotides form double stranded molecules The strands have direction Sugar-phosphate backbones are antiparallel (run in opposite 5’ —> 3’ directions) 5’ end 5’ end 3’ end 3’ end Hydrogen bonds Is it easier to cut a strand apart, or to separate the strands?
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Bases pair by hydrogen bonding adenine (A) with thymine (T) guanine (G) with cytosine (C) Which combination of base pairs is stronger? Why do the bases have to pair this way?
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Chains of nucleotide bases (ATCG) Specific binding between bases across DNA strands DNA is read in only one direction
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  • Fall '16
  • lanning
  • Biology, DNA, RNA, cytosine, Thymine, Dr.Valerie Wong, Review of Key Macromolecules

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