Answer: It could happen in two main mechanisms:1) the allele responsible for the disease is recessive and so each of the parents are healthy portators of the allele (heterozygous), and all the sons which are homozygous for the allele (i.e. have two copies of the allele), with a frequency of 1:4, will be affected by disease, but not the others (heterozygouses and homozygouses for the good allele or wild type).2) the mutation responsible for the disease (that acts in a dominant manner) is not present in any of the parents but happens only during the formations of gametes, and so will be transmitted to the son.There are also other mechanisms that are less frequent and more difficult to explain in a few words.
Answer: Not always. It depends if the individual is a hybrid- meaning they have both the dominant and the recessive gene. They can pass on the recessive gene instead of the dominant one, and assuming the other parents also passes on the recessive gene, the child will not inherit the disease.
Answer: one does die of alzheimers disease, if they are taken good care of, they wont die of anything else memory related. once alzheimers disease progresses to the autonomic nervous system(involuntary)the one that controls breathing,heartrate,vasoconstriction and dialation, it kills you. it does directly kill you eventually, it will stop your heart or lungs. most people arent taken care of enough to let them get to that stage. and they do die of a self inflicted injury(falls,hyperglycemia,pneumonia etc.)
Answer: According to a report in 1998, more than 6000 cases had been described. The disease occurs in about one in a million people per year. Estimates of disease incidence in Japan are as much as ten times greater
Answer: The CDC is responsible for tracking and identifying diseases to prevent the spread of the diseases. They also have a role to bring awareness of these infectious diseases. They chart the numbers of people who have contracted the disease and the numbers of people who have died from them, etc.