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.
As you might expect, a good blood pressure reading is one that is neither too high nor too low. In most cases, a reading under 120/80 is considered healthy. Because blood pressure can vary throughout the day, it's best to use the average of more than one reading when deciding if your blood pressure is good or not.