The need for hearing aids pretty much goes hand-in-hand with aging. And yet Medicare doesn't cover them. Hearing aids are considered an elective, and just like with eye glasses, patients are responsible for 100 percent of the bill. Hearing tests are also the responsibility of the Medicare patient. Regulations vary by the state and there may be some exceptions but, overwhelmingly, this statement is true: Older people need hearing aids and glasses and Medicare doesn't pay for them. And it would take an act of Congress to get that to change.
From Wikipedia, the free encyclopedia. Allele frequency, or gene frequency, is the relative frequency of an allele (variant of a gene) at a particular locus in a population, expressed as a fraction or percentage. Specifically, it is the fraction of all chromosomes in the population that carry that allele.
Image Credit: Main Image: Gene Amplification, also known as gene duplication or chromosomal duplication, is a cellular process in which multiple copies of a gene are produced. The result is an amplification of the phenotype, or expressed trait, associated with the gene.ot all gene amplification has great importance to evolution. Sometimes, the amplified trait dies with the single organism that experiences the gene duplication. This happens when a gene is over expressed and the trait it codes for is expressed to a level that is unhealthy to the organism.