In seed plants, __________ allow reproduction without standing water. Fill in the blank(s) with the appropriate word(s)
ANSWER: pollen grains
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The disease characterized by a high blood glucose due to a deficiency of insulin production or failure of cells to respond to insulin is ____________ mellitus.
Fill in the blank(s) with the appropriate word.
Which of the following animal phyla is distinguished by a lack of tissues?
A) Roundworms B) Annelids C) Echinoderms D) Sponges E) Flatworms
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.
Genetic differences between populations tend to be reduced by
A) gene flow. B) mutation. C) the founder effect. D) natural selection.