Chapter 19 Eukaryotic Genomes

Chapter 19 Eukaryotic Genomes - Chapter 19 Eukaryotic...

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Chapter 19 Eukaryotic Genomes Eukaryotic Chromosome - Consists of a linear molecule of double stranded DNA. - It is composed of DNA a nd protein - Nucleoso m es are the most basic units of DNA p acking Nucleoso m es or “Beads on a String” - Nucleoso m es are the most basic units of DNA p acking - Nucleoso m es are compos ed m ostly of DNA a nd histone proteins that bind to e ach oth - Histone tails extend outward from e ach b e a d-like nucleoso m e core. - Histone proteins allow the cell’s DNA to b e packed into its nucleus. Higher Levels of DNA Packing - Additional folding leads ultimately to the highly cond ens ed chrom atid of the m et aph a chromoso m e - In interphas e cells, most chrom atid are less comp act but so m e re m ain highly cond en Differential Gene Expression - Each cell of a m ulticellular Eukaryote express es only a fraction of its gen es (about 2% - Differences b etwe en cell types are du e differential g en e expression, the expression o different g en es by cells with the sa m e geno m e. -
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Chapter 19 Eukaryotic Genomes - Chapter 19 Eukaryotic...

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