By the year 2010, 17.8 million youths aged 16-19 will work, up from 16 million in 2000, according to government forecasts. Young workers suffer a disproportionate share of injuries and fatalities, especially in the first year on the job. In 2006, 30 youths under 18 died from work-related injuries.
A mutation may or may not affect the amino acid sequence. A mutation may or may not affect the phenotype. Some specific mutations in a gene may have more adverse affects than other mutations in the same gene. A mutation is not necessarily bad. It may even be good. A mutation may enhance or positively change the function of the protein produced by the gene.
Therefore, genetic diseases can be inherited. Genetic defects cause diseases in a variety of ways. The simplest way is through a loss-of-function mutation. In this type of defect, a change in the DNA nucleotides prevents the gene from making protein, or prevents the protein from functioning once it is made.n the human population, there are several variants (alleles) of most genes, each form of which. is functional and does not cause disease by itself. However, some alleles may predispose a person to a certain disease, especially in combination with other alleles or environmental factors that influence the same trait.