In humans, skin color is controlled by several genes. Thus, skin color is a(n) ____ characteristic.
a. dominant
b. co-dominant
c. epistatic
d. pleiotropic
e. recessive
C
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Most phyla of aquatic invertebrates have improved the rate of gas exchange by creating a water current over their respiratory surfaces, thereby _____.
A. changing the diffusion constant B. increasing the surface area for diffusion C. decreasing the distance for diffusion D. increasing the concentration difference
Why is the traditionally defined taxon Reptilia paraphyletic?
What will be an ideal response?
A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
During which stage of interphase is DNA replicated?
A) G2 B) G1 C) S