LEC07 - Clicker question will be regraded Genes in...

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Genes in eukaryotes are usually interrupted with non-coding regions (introns)
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DNA-RNA hybrid identifies introns as loops Alternatively, genome sequence can be compared to mRNA
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Arabidopsis (model plant) genome: 9000 bp exon intron Transcribed left to right Transcribed right to left
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Human genome: 7000 bp Exons much smaller than introns Gene density is much lower exon intron One gene Humans: ~25,000 genes Fruit flies: ~14,000 genes Rice: ~ 38,000 genes
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Figure 8-2
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Figure 8-4 Transposable elements
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Retrotransposons are closely related to retroviruses RT-reverse transcriptase 20% human genome
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Figure 8-5 Pseudogenes: copies of coding regions with no regulatory sequences
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Eukaryotic chromosome s are visualized after DNA synthesis but before segregation
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Chromosomes Are Linear Arrays of Genes Each chromosome in a cell contains only a single linear double-stranded DNA molecule. Circular DNA is also found in mitochondria, chloroplasts and some viruses
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(already replicated)
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Both telomeres and
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  • Winter '12
  • Lin
  • DNA, supercoils

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