2 points) AccomplishesForms neural tube (CNS, nerve cord, spinal cord, brain, nervous system)Forms neurulaForms neural crests (max. 3 points)Epidermal thickening, flattening in dorsal midline (neural plate formation)Plate develops longitudinal depression (neural groove, neural folds)Neural folds fuseNeural tube pinches free of epidermis, sinks inward Notochord (chordamesoderm) required for neurulation (max. 2 points) AccomplishesForms blastula or hollow ball of cellsForms blastocoelForms blastomeres (micromeres, macromeres)Forms or increases DNA in embryoProduces unequal distribution of cytoplasmic contents in blastomeres (max. 3 points)Mitotic or cell division, or increase in cell numberNo cellular growthHoloblastic (complete division)UnequalRadial (Indeterminant)Involves use of maternal RNA 1st vertical 2nd vertical, perpendicular to 1st3rd horizontal, perpendicular to 1st and 2nd, unequalGrey crescent establishes planes of cleavage Divisions more rapid at animal pole (max. PETERSON/ECHSĝiscuss the processes of cleavage, gastrulation, and neurulation in the frog embryo tell what each process accomplishes.ĝescribe an experiment that illustrates the importance of induction in development. STANDARDS: 1 point for each major item under each major headingCLEAVAGE (max. You may download this entire file in Microsoft Word Format, or you may preview the questions and standards by year through your web browser by selecting the appropriate year.ĭEVELOPMENT QUESTION 1988: L. AP Biology Development Questions andStandards
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