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.
Normal blood pressure range is a systolic number less than 120 and diastolic reading of less than 80. Systolic, which is the top number, measures pressure in the arteries during heart beats. Diastolic, the lower number, measures the pressure in the arteries between heartbeats.