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]).
It is that part of the parietal pleura that lines the Intercostales and the inner rib 1  [â¦]. Visceral pleura-Definition, Functions and Pictures-July 19, 2012 [â¦] runs continuous with the parietal pleura, which is located at the lung base and covers the diaphragm as well as lines the inner chest walls. Costal pleura-Location, Function and Images-July 18, 2012 [â¦] as the most extensive and strong section of the parietal pleural membrane. 2  It is that part of the parietal pleura that lines the Intercostales and the inner rib [â¦].