Genetic variation is stored in a populationâs gene poolâthe combined. alleles of all of the individuals in a population. Different combinations of. alleles in a gene pool can be formed when organisms mate and have offspring. Each allele exists at a certain rate, or frequency.
Also found in: Wikipedia. cosÂ·tal surÂ·face. the surface of certain structures that face the ribs; they are the costal surfaces of the lungs (facies costalis pulmonis [TA]) and the scapula (facies costalis scapulae [TA]).
HDL, or high-density lipoprotein, has long been thought to correlate to heart-heath. HDL, often called the good cholesterol, functions as a shuttle that takes cholesterol from the blood stream (where it can form a blockage and lead to heart disease, also known as atherosclerosis) and transports it to the liver.