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.
The blood pressure reading might show the systolic and diastolic pressures to be, for example, 120 and 78mm of mercury (Hg) respectively -- written 120/78 and said to be 120 over 78.. A typical blood pressure reading for an adult might, in fact, be 120/78. Readings vary depending on age and many other factors.