A dominant gene will always be expressed when present, such as in the homozygous dominant genotype (RR), or heterozygous genotype (Rr). A recessive allele is only expressed wh â¦ en the genotype is homozygous recessive (rr).
(Lung alveoli, in contrast, are lined by very thin simple squamous epithelium .). Pseudostratified respiratory epithelium consists primarily of columnar ciliated cells. Ciliary beating sweeps mucus and the dust it carries up the bronchi and trachea toward the pharynx, where it can be swallowed.
The pseudostratified columnar ciliated epithelium lining the trachea in this species is reduced as compared to the human. #89 Lung, Rabbit H&E. An intrapulmonary bronchus may be included in some sections and is identified by irregularly shaped cartilage plates in its wall.