A geographic barrier is needed for ______ speciation.

a) allopatric
b) sympatric


Answer: a) allopatric

Biology & Microbiology

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Choose one of the basic patterns of Mendelian inheritance and draw and explain a three-generation family pedigree illustrating that pattern

What will be an ideal response?

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Suppose a cell's membrane is permeable to water, but not to Na+ or Cl? or any other solute. The NaCl concentration is

higher outside the cell than inside the cell, and the osmolarity of the cell is higher than that of the solution surrounding the cell. What will occur?

a. Overall, the cell will lose water. b. Overall, the cell will take up water, Na+, and Cl?. c. Overall, the cell will take up water. d. Overall, the cell will take up water and lose Na+ and Cl?. e. Overall, the cell will lose water and take up Na+ and Cl?.

Biology & Microbiology

Isotopes of the same element differ from each other in the number of

a. electrons and protons. b. neutrons only. c. protons and neutrons. d. electrons only. e. protons, neutrons, and electrons.

Biology & Microbiology

Water absorption depends primarily on

a. abscisic acid. b. cohesion-tension. c. the concentration gradient between soil and root. d. active transport. e. the potassium pump.

Biology & Microbiology