Both deletions and insertions occur during the evolution of microbial genomes. Insertions bring in new genes that may be useful for the cell. Deletions
A. may increase fitness of a microorganism by eliminating unneeded genes.
B. always result in a severe loss of fitness for the microorganism.
C. are uncommon because they are usually lethal.
D. always result in a severe loss of fitness but keep microbial genomes compact.
Answer:A
Both deletions and insertions occur during the evolution of microbial genomes. Insertions bring in new genes that may be useful for the cell. Deletions
A. may increase fitness of a microorganism by eliminating unneeded genes. B. always result in a severe loss of fitness for the microorganism. C. are uncommon because they are usually lethal. D. always result in a severe loss of fitness but keep microbial genomes compact.