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.
I have tried turning the laptop off and back on again but there was no change. My laptop is quite new and I only got this laptop for Christmas. I have plugged a USB mouse into my laptop and that seems to work, I then disabled the mouse and the touchpad still would not work. I cannot click the two buttons below the touchpad either. More about : touchpad laptop stopped working fix.