Genetic Disorders Essay
Life on Earth relies on the mutation of DNA. Mutations allow organisms to evolve, making them healthier and more capable of surviving. While many mutations occur that help species to survive, there are also just as …show more content…
The gene for Huntington’s disease is found only on the X chromosome, making it a sex-linked trait. Since the gene is found on the X chromosome, it can only be given to offspring by the mother’s DNA. Sex-linked traits can only be expressed if there is not another X chromosome to counter the mutated gene with its normal gene. This puts males (have X and Y chromosomes) at a huge disadvantage because they do not have another X chromosome like females (have two X chromosomes) do. Males with mothers who are carriers of the mutated gene have a fifty percent chance of inheriting disease because there are two X chromosomes (one has the mutated gene) in which they can be given. This is why sex-linked traits, such as the gene for Huntington’s disease, most often affect males. Although females of mothers with the mutated gene are less likely to be affected by the mutated gene, they can be carriers of the mutated gene and pass it on to their offspring.
Although there is no cure for Huntington’s disease, scientists have made a lot of progress towards finding a cure. In 1983, a scientist named Nancy Wexler and others discovered that the gene for Huntington’s disease was located on the short arm of chromosome 4. Almost a decade later