Microevolution involves ________
A. changes in a population's gene pool.
B. a change in the ratio of males to females in a population.
C. the fixation of an allele over a long period of time.
D. changes to the number of individuals in a population.
Answer: A
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Mendel's principle of segregation corresponds to what part of meiosis?
A. Condensation of chromosomes in prophase I B. Alignment of homologues in metaphase I C. Separation of homologues in anaphase I D. Alignment of chromosomes in metaphase II E. Separation of daughter chromatids in anaphase II
The time it takes for half of a radioisotope's atoms to decay ____.
A. cannot be calculated B. is used to construct the geologic time scale C. is its half-life D. is the same for uranium 238 and carbon 14 E. is highly variable
Endothelial cells that line the inside of blood vessels:
A) are nonliving cells made of protein. B) are made of epithelial squamous cells. C) regulate blood flow and coagulation. D) are composed of specialized nervous tissue
Which of the following is a polymer?
A) wax B) steroid C) nucleic acid D) fat