Two species of salamander have similar ranges, but one breeds from January to March, while the second one breeds from March to May. This is an example of
A. mechanical isolation.
B. temporal isolation.
C. habitat isolation.
D. behavioral isolation.
E. gametic isolation.
B. temporal isolation.
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Which statement characterizes cancer cells?
a. Mitosis in cancer cells is strictly regulated. b. Cancer cells form tumors that adhere strongly to surrounding tissues. c. Cancer cells display uncontrolled cell division. d. Tumors formed by cancer cells remain encapsulated and only grow in one location. e. Cancer cells behave like normal cells.
An allele is ____ if its effect masks that of a ____ allele paired with it
a. recessive; codominant b. codominant; recessive c. recessive; dominant d. dominant; recessive
e. incompletely recessive; dominantFor the following pedigree, what does the green circle in the fourth generation represent?
A. male without the disease B. female with the disease C. male with the disease D. female without the disease
The proteins Rab, Ran, and tubulin are all
a. polymers. b. nuclear proteins. c. G proteins, regulated by bound GTP or GDP. d. parts of signal transduction pathways. e. components of mitotic spindles.