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.
with 21 comments. If you just bought yourself a Dell laptop and youâre wondering how the hell you can turn off the keyboard backlight so that you can save some battery power, thereâs a way. Dell gives an option to turn off the keyboard backlight in the Windows Mobility Center. All you need to do is right click on the battery icon in your system tray and click on Windows Mobility Center. The Mobility Center Window pops up and you can either adjust the brightness of the keyboard backlight or even turn it off completely.