polyploidy. 1  the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes. 2  Ploidy, the concept of the number of complete sets of genes organized into chromosomes, is inapplicable to prokaryotes. ... 3 from it in essence.
Healthcare providers consider a normal blood pressure reading to be 120/80 or below. However, it can actually fall anywhere in a range from 90/60 to 120/80 -- it's not just one set number. The number on top of the reading is called the systolic pressure.
Range. According to MayoClinic.com, a normal blood pressure reading is below 120/80, although some doctors prefer to see readings lower than 115/ 75. Prehypertension occurs when the blood pressure reading is between 121/80 and 139/ 89. High blood pressure is defined as anything above 140/90. Low blood pressure occurs when the reading drops below 90/50.