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.
19 Genotype, phenotype and haplotype Genotype: At a specific locus there is an allele in each of the two homologous chromosomes. The two alleles together are called genotype. Phenotype: Observable, such as height, color of eye, etc.