Considerably more phenotypic variation exists in domesticated varieties of species like dogs and cabbages than exists in nondomesticated species like lions and maple trees. Which one of the following statements best explains why this is true?
A. Genetic drift is important because domestication involves small populations.
B. Domesticated species exhibit hybrid vigor (heterosis).
C. During domestication, very high rates of mutation are induced.
D. Many domesticated varieties would not survive in the natural world.
E. There is no selection and mating is random under domestication.
Answer: D
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A housekeeping gene is one that codes for a product that:
A. functions in removing dirt from the cell. B. is expressed differentially based on the needs of the cell. C. is expressed at a constitutive level. D. functions exclusively in cell membrane maintenance.
Which of the following is NOT a line of evidence that Kingdom Animalia is a monophyletic group?
a. The ribosomal RNA of animals is more similar to that of other animals than it is to any other form of life. b. Animals share unique similarities in their cell-to-cell junctions. c. All animals have the same genetic code. d. Animals share similarities in the molecules in their extracellular matrices. e. All animals have bilateral symmetry.
The base of a pyramid of energy represents the
a. primary producers. b. decomposers. c. primary consumers. d. secondary consumers. e. primary carnivores.
The light level at which the rate of carbon uptake in photosynthesis equals the rate of carbon loss in respiration is the light ________ point
Fill in the blank(s) with correct word