In X-linked inheritance, the gene for albinism is located on an X chromosome. If the father is normal and mother is a normal carrier, the chance (percentage) for the child to be a normal carrier (genotype) is:
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
Ans: b. 25%
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The cardiac notch
A. is on the medial aspect of the right lung. B. is on the medial aspect of the left lung. C. is a notch on the heart where the coronary arteries originate. D. is where the pulmonary trunk rests on the heart.
Which class of antibodies are commonly called gamma globulin?
A. IgM B. IgE C. IgG D. IgA E. IgD
Place the events of the propagation of an action potential in a MYELINATED axon.
What will be an ideal response?
Eyelids serve two purposes: one is to protect the eye and the other is to
A. help distribute blood to the eye surface. B. help distribute lacrimal fluid to cleanse and lubricate the surface. C. help spread antiviral solution. D. help to control the transmission of the nerve impulse to the retina. E. prevent excess mucus from obscuring vision.