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What must happen before meiosis can begin? a. four gametes must be produced b. the four tetrads must be pulled apart c. dna doubles and produces sister chromatids d. the cell membrane pinches together
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Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.
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Tell me an animal that was extinct but is now alive today...
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