Which term describes the way homologous pairs of chromosomes line up at metaphase I and eventually separate during anaphase I?
A. crossing over
B. independent assortment
C. genetic variation
D. random fertilization
B. independent assortment
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Due to countercurrent flow in fish gills, __________
with the __________ oxygen concentration is always in contact with __________ containing __________ oxygen. a. blood; most; water; less b. water; least; blood; less c. water; greatest; blood; greater d. blood; greatest; blood; less e. water; greatest; water; less
Following balloon angioplasty, a small wire cylinder known as a ____ may be inserted to keep the
artery open. a. shunt b. shaft c. stent d. pipette e. bushing
The embryonic germ layer of tissue in animals that develops into the digestive tract and organs derived from the digestive tract is the
A. pachyderm. B. ectoderm. C. mesoderm. D. endoderm. E. protoderm.
Which of the following statements regarding the process of speciation is correct?
(A) Speciation occurs so slowly that scientists have never observed the emergence of a new species (B) Speciation only occurs slowly as small genetic changes accumulate from generation to generation (C) Speciation can occur as a result of changes in a single gene (D) Speciation requires the geographic isolation of a small population from a larger parent population