Polygenic inheritance can be explained as Mendelian inheritance at many loci, resulting in a trait which is normally-distributed. If n is the number of involved loci, then the coefficients of the binomial expansion of (a + b) 2n will give the frequency of distribution of all n allele combinations.
Once the pacemaker is implanted, the leads carry signals back from the heart. The pulse generator reads these signals and the batteries send electrical impulses to the heart to help pace it. Most pacemakers can sense the heart's rhythm and turn themselves off when the heartbeat is above a certain level. They will turn on again when the heartbeat is too slow. These types of pacemakers are called demand pacemakers.
â¢ Tell your other doctors and your dentist that you have. a pacemaker. Certain types of medical equipment may. affect how a pacemaker works. â¢ Tell airport security that you have a pacemaker. A pacemaker is a small device that helps your. heart beat more regularly. It does this with a. small electric stimulation that helps control your. heartbeat. Your doctor puts the pacemaker under. the skin on your chest, just under your collarbone. Itâs hooked up to your heart with tiny wires.