Myofibrials are what?
What will be an ideal response?
Answer: Bundles of contractile filaments
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Which of the following did NOT contribute to an understanding of the immutable nature of species?
a. homologous bones b. vestigial structures c. global exploration of fauna and flora d. fossils e. genetics
Gene therapy
a. has not yet been used successfully with mammals. b. is a surgical technique that replaces defective genes with normal genes. c. has been used successfully to treat victims of autosomal dominant disorders by replacing the dominant allele with a recessive allele. d. is a genetic engineering technique that replaces defective alleles with normal ones. e. is none of these.
A "rain shadow" describes
A) shadows cast by the mist and clouds that hover above the crest of a mountain range. B) forested conditions of mountain ranges. C) mountainous areas where dry descending air absorbs moisture and there is little precipitation. D) dark-colored chaparral vegetation that grows on the mountain ranges.
The variations in oldfield mouse coat color illustrated in the figure above could result from:
a. genetic differences. b. environmental differences. c. differences in diet. d. exposure to sunlight. e. All of the above.