A phenotype is a trait we can observe. Genes carry instructions, and the result of our body following those instructions (for example, making a pigment in our eyes), is a phenotypic trait, like eye color.
The medical term for expanding or opening wider is. apnea. the medical term for lack of or absence of breathing is. tissue. the medical term for groups of cells with the same function is. cell. the medical term for the basic unit of body structure is. menarche.
1 Paroxysmal nocturnal dyspnea (PND) is severe shortness of breath while sleeping requiring the patient to rise up and seek more air as by opening a window. 2  It is seen in patients with left heart failure. 3  Platypnea is difficulty in breathing in the upright position, which improves when the patient lies down.