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.
Types of non-keratinized epithelium include tissue that lines the esophagus. Skin is made up of epithelial tissue. Transitional epithelium is found only in the urinary system structures of the renal pelvis, bladder ureter and urethra.The urothelium is tissue found in the bladder that helps prevent previously filtered wastes from getting back into the bloodstream.here are also two specialized types of stratified epithelium: keratinized and transitional. Keratinized epithelial tissue is found only on the external surfaces of the body, including the inside of the mouth.