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.
Find out with our interactive checkup. If your blood pressure is 120/80 millimeters of mercury (mm Hg) or lower, your blood pressure is considered normal. If the blood pressure reading is under 90/60 mm Hg, it is called hypotension. Some adults regularly have a blood pressure in the hypotensive range, but have no symptoms at all and do not require treatment.