A power line cut has isolated 50 sowbugs from its original population of 15,000. After only five generations, the new population exhibits dramatic differences from the original one, most likely because
a) members of a small population tend to die off more quickly, removing alleles from the gene pool
b) gene flow increases in a new environment
c) the new environment is different from the old, favoring natural selection
d) mutations are more common near a power line
e) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool
Answer: e) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool
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Which statement is true?
a. The production of gametes via meiosis is much simpler than mitosis because the resulting gametes only contain half as much genetic material. b. Chromatid crossover rarely results in viable zygotes because gametes lack a mechanism for lining up homologous gene sequences when this happens. c. The potential genetic variation between two zygotes is greater than the potential genetic variation between skin cells from the same organism. d. Because they are not homologous chromosomes, X and Y chromosomes do not form synaptonemal complexes during meiosis.
Which of the following is a characteristic of octopuses and squid?
a. an open circulatory system b. a closed circulatory system c. the presence of mesohyl d. a single heart
Which of the following belongs to the phylum
characterized by a mantle and a radula? a. lobster b. rotifer c. octopus d. sand dollar e. polychaete
Which of the following statements is correct for both spermatogenesis and oogenesis?
A. They function, approximately, on a twenty-eight day cycle. B. They each have two meiotic divisions. C. They produce polar bodies. D. All of these statements are correct for both processes.