Genes are composed of exons and all the exons in the genome comprise the exome. Using a Fermi estimation, what is a reasonable estimate for the size of the human genome? 3 x 10e6 bp 3 x 10e7 bp 3 x 10e8 bp 3 x 10e9 bp 3 x 10e10 bp
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Step 1: The size of the human genome is estimated to be around 3 x 10^9 base pairs (bp). Show more…
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Make a very rough estimate of the average density of protein-coding genes in the human genome. (Total genome size ~3 × 10⁹ bp; total number of genes ~3 × 10⁴ genes.)
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Given that the human genome is 3.2 billion base pairs, calculate the length of DNA in a typical human diploid somatic cell. Assume B-form DNA. i) Length of DNA in a human cell: 3.2x10^9 base pairs * 0.34x10^-9 m/base pair = 1.088 meters ii) Calculate the number of nucleosomes needed to wrap the DNA in a human cell into chromosomes: Assume 200 bp DNA per nucleosome: 3.2x10^9 bp / 200 bp = 1.6x10^7 nucleosomes iii) Calculate the number of histone protein molecules needed to wrap the DNA in a human cell into chromosomes.
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The minimal genome can be estimated for a prokaryote a. by counting the total number of genes. $b .$ by comparative genomics. $c .$ as about 5,000 genes. $d$. by transposon mutagenesis, one gene at a time. $e .$ does not include any genes coding for tRNA.
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