Use the figure to answer the question. The figure shows a simple metabolic pathway. According to Beadle and Tatum's hypothesis, how many genes are necessary for this pathway?

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#Question id: 8933

#Unit 9. Diversity of Life Forms

At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?

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#Question id: 8934

#Unit 9. Diversity of Life Forms

At which developmental stage should one be able to first distinguish a protostome embryo from a deuterostome embryo?

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#Question id: 8935

#Unit 9. Diversity of Life Forms

What may have occurred to prevent species that are of the same grade from also belonging to the same clade?

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#Question id: 8936

#Unit 9. Diversity of Life Forms

Organisms showing radial symmetry would likely

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#Question id: 8937

#Unit 9. Diversity of Life Forms

During metamorphosis, echinoderms undergo a transformation from motile larvae to a sedentary (or sometimes sessile) existence as adults. What differentiates echinoderm adults, but not their larvae? Adults should

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#Question id: 8938

#Unit 9. Diversity of Life Forms

Cephalization is primarily associated with