Some of the most common diseases are infections caused by bacteria, such as Campylobacter, Salmonella, Shigella, E. coli O157:H7, Listeria, botulism, and norovirus.
A genotype is the actual genetic coding for an organism. A phenotype is the physical appearance. For example, let's say BB or Bb is the coding for black hair. BB/Bb is the genotype, and the black hair is the phenotype.
The genotype is the specific genetic makeup of an individual, in the form of DNA. and it codes for the phenotype of that individual. Any given gene will usually cause an observable change in an organism, known as the phenotype. However, genotype and phenotype are not always directly correlated.