An example of multiple-allele inheritance is ________
A) hair that seems to have several shades of a color
B) the appearance of birthmarks on the skin
C) the appearance of freckles on the skin
D) the ABO blood group
D
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The first heart sound is the closing of the:
a. pulmonary semilunar and aortic semilunar valves b. tricuspid and mitral valves c. mitral and bicuspid valves d. tricuspid and pulmonary semilunar valves
Which muscle pulls the skin of the chin upward?
A. Masseter B. Mentalis C. Depressor anguli oris D. Platysma E. Depressor labii inferioris
The secretion of hormones operates on a negative feedback system.?
Indicate whether the statement is true or false
Oxygenated blood reaches the fetus through the ________
A) placental sinus B) umbilical vein C) maternal arteries D) umbilical arteries E) maternal vein