Chest Radiology > Pathology > Atelectasis > General. Atelectasis is collapse or incomplete expansion of the lung or part of the lung. This is one of the most common findings on a chest x-ray. It is most often caused by an endobronchial lesion, such as mucus plug or tumor.
A Labradoodle, a crossbreed between a poodle and a retriever. A crossbreed or crossbred usually refers to an organism with purebred parents of two different breeds, varieties, or populations.
Definition: A monohybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in one trait. Related Terms: Dihybrid Cross, F1 generation, F2 generation, P generation, True-breeding Plant.