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.
1. B; The small ducts of exocrine glands are lined by simple cuboidal cells. 2. D; In the trachea pseudostratified epithelium, all cells rest on the basal lamina. Bladder transitional epithelium is stratified and therefore not all cells touch the basal lamina.3. A; Another function of stratified epithelia is to serve as a barrier.. D; In the trachea pseudostratified epithelium, all cells rest on the basal lamina.