A cross between a rose comb chicken (RRpp) and a
pea comb chicken (rrPP) produces all walnut comb
chickens (RrPp). This outcome is a result of
a. environmental factors.
b. two interacting gene pairs affecting one trait.
c. a gene mutation in the rose comb chicken.
d. pleiotropic effects of the P gene product.
e. continuous variation in phenotypes.
Answer: b
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A) 1/4 B) 1/8 C) 1/16 D) 1/32 E) 1/64
Answer the question using the accompanying figure. The atomic number of the atom depicted in the figure is ____
a. 4 b. 6 c. 8 d. 12 e. 18
Choose all of the homeostatic variables that provide energy in animals.
A. Ca2+ B. ATP C. Fat D. Glucose E. Water
Match the terms with the labeled structures on the diagram. 
cell body
Fill in the blank(s) with the appropriate word(s).