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.
Both the gastric epithelium and intestinal epithelium are simple columnar, non-ciliated epithelial tissue. Epithelium is a type of animal tissue that lines the inner surface of several organs in the body. In fact, the word Epithelium finds its origins from the Greek words âEpiâ (that means on/onto) and âtheliâ...