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.
Quick Answer. According to the American Heart Association, a healthy blood pressure reading is equal to or less than 120 over 80. The top number refers to systolic pressure, which is the pressure against artery walls when the heart pumps. The bottom number, diastolic pressure, represents pressure between beats.