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Down syndrome is the result of an extra chromosome 21 in a gamete. What caused this to happen?
nondisjunction
telomeres
environment
chromosome inactivation
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Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.
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Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16
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Down syndrome is the result of an extra chromosome 21 in a gamete. What caused this to happen?
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