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.
Posts: 2. Engine won't shut off, not ignition switch! We're having one heck of a sporadic behavior on our 2000 A4 that neither the dealer nor the independent shop can identify. Simply, on occasion, when you go to the turn the car off, you can just remove the key and the engine and all electronics stay on.o turn the car off when the key is removed and everything is running, we've discovered that you can tap the brake pedal. Depress the brake pedal a bit and everything, engine and electronics, all shut off.