Studies have found that a bacterium of the genus Buchnera has been living as a parasite of aphids for many millions of years.This bacterium lacks certain genes that are involved in the production of the cell wall found in other related bacteria.The field of biology in which such studies were carried out is called

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Comparative genomics is the study of the similarities and differences in the genomes of different organisms. In this case, the study involved comparing the genome of Buchnera with other related bacteria to identify the genes that it lacks. Metagenomics involves the study of genetic material recovered directly from environmental samples, while eukaryotic genomics focuses on the study of the genomes of eukaryotic organisms. Proteomics involves the identification and study of proteins, and haplotype mapping involves the study of genetic variations that are inherited together.

Studies Have Found That a Bacterium of the Genus Buchnera