The inheritance of sickle cell anemia involves incomplete dominance. (S determines normal hemoglobin, it is dominant; s is the sickle cell gene). A homozygous recessive person has sickle cell anemia. A heterozygous person has the sickle cell trait. If
parental genotypes are SS and ss, what is the probability of offspring having the sickle cell trait?
A) 50%; half are Ss B) 100%; all are Ss C) 25%; one quarter are Ss
Answer: B
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When you "pull your tummy in" and compress your abdomen, you use the rectus abdominis, external abdominal oblique, internal abdominal oblique, and transversus abdominis muscles. This is an example of muscles working as
A. fixators. B. synergists. C. antagonists. D. prime movers. E. cooperatives.
Urine flows through the ureters to the bladder as the result of
A. gravity. B. a pressure gradient. C. a concentration gradient. D. peristaltic contractions. E. osmotic gradient.
Degeneration of the neurons in which of the following structures leads to the muscle tremors associated with Parkinson disease?
A) Substantia nigra B) Tegmentum C) Pons D) Inferior colliculi E) Cerebral crus