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.
Pseudostratified columnar epithelium. Pseudostratified columnar epithelium is found lining the trachea, bronchi, male urethra, and a few other places.The slide you will examine is taken from the trachea. Use the low magnification image to identify the epithelial layer, then examine it at higher power.seudostratified columnar epithelium is found lining the trachea, bronchi, male urethra, and a few other places. The slide you will examine is taken from the trachea.