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 trachea is made up of the following tissues: 1. mucosa-inner layer made up of Pseudostratified ciliated columnar epithelium 2. submucosa-middle layer which has zero muc â¦ us glands and it is made up of connective tissue 3. adventila-outer layer made up of hyaline cartilage.23 people found this useful.he trachea is made of cartilage.   The trachea, or windpipe, is the bony tube that connects the nose and mouth to the lungs, and is an important part of the vertebrate respiratory system. + 66 others found this useful. Annette Pacheco. Alexander Rowan.