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

Biology & Microbiology

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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

Biology & Microbiology

Why is the traditionally defined taxon Reptilia paraphyletic?

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology

During which stage of interphase is DNA replicated?

A) G2 B) G1 C) S

Biology & Microbiology