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. Many people define normal blood pressure as an average reading of 120/80 or below. An average blood pressure can only be determined when multiple readings are taken over at least three days. Several things (such as lifestyle and family history) can affect a person's blood pressure range. Be mindful of this when comparing your reading to what's considered normal blood pressure..