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.
Blood pressure is considered normal in adults if it's approximately 120/80 millimeters of mercury (mm Hg). If the top number, known as systolic blood pressure, is 90 mm Hg or less, or the bottom number, diastolic blood pressure, is 60 mm Hg or less, that is generally considered low blood pressure.