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Gene Density in Different Organisms
Species
Genome Size
Approx. # of
genes
Gene density
(genes/Mb)
Escherichia coli
4.6
4,400
950
Agrobacterium
tumifaciens
5.7
5,400
960
12
5,800
480
Arabidopsis
thaliana
125
25,500
200
Drosophila
melanogaster
180
13,700
80
Homo sapiens
2,900
27,000
9.3
PROKAYOTES:
EUKARYOTES:
Sacharomyces
cerevisiae
Structural organization
of the genome
The nucleosome
1
The 30-nm Fiber
Chromosome Scaffold
Heterochromatin and Euchromatin
2
Gene Expression
DNA
RNA
Protein
Replication Transcription Translation
Phenotype
*Gene
*Gene expression
Genes control inherited variation via:
DNA, RNA and protein
*Protein coding gene
Phenotype
Brief overview of transcription:
3
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