Biology 1201A Chapter Notes - Chapter 16: Takifugu Rubripes, Desert Locust, Methanosarcina Acetivorans
5 Apr 2018
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16. 2b genome landscapes vary markedly in size, gene number and gene density. Since many genomes are now sequenced, researcher can compare them to learn about genome sizes, the number of protein-coding genes and the density of these genes (how widely spaced they are) A vast amount of new information is available about genome landscapes. The following diagram shows the ranges of genome sizes for viruses, bacteria, archaea and different groups of eukaryotes. This next table gives examples of genome sizes and the number of protein-coding genes for some bacteria, archaea and eukaryotes. From this table, we can conclude that members of both the domain bacteria and the. Domain archaea have genomes that vary widely in size. We can also conclude that their genes are densely packed in their genomes, with little noncoding space between them. Hence, the larger genomes of organisms in these 2 domains tend to reflect increased gene number.
