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- An unidentified substance (or substances) released from the developing notochord causes the overlying ectoderm to form the neural plate. This phenomenon is known as (a) activation (b) determination (c) induction (d) implantation (e) mosaic developmentDefine and describe the main features of the following developmental stages: fertilization, cleavage, gastrulation.Label the early development stages shown in the following diagram.
- Which statement does NOT accurately describe somites? series of tissue blocks form the ribs and intercostal muscles paired structures running along either side of the neural tube derived from neural crest tissue on the ventral surface of the embryoFrom a 24-hour chick embryo, provide the answers in the following: Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seenWhat critical developmental process/es are altered following retinoic acid-exposure, which may cause protrusion of the spinal cord through the vertebral arches? Select one or more: O A. Primary neurulation, where the neural plate creases inward until the edges come in contact and fuse. O B. Secondary neurulation, where the tube forms by hollowing out of the interior of a solid precursor. O C. Regulation of neural crest migration from the neural tube to generate segmental ganglia. O D. Abnormal somite formation affecting the development of muscles of the back.
- Endoderm Mesoderm Ectoderm Match the structures below with the correct germ layers listed above that they are formed from. Number: Answer Answer Answer Answer Tissues and Organs: Central Nervous System Lining of the Digestive Tract Skin SkeletonWhich statement accurately describe somites? derived from neural crest tissue on the ventral surface of the embryo series of tissue blocks lateral to the neural tube a shared derived feature seen only in gnathostomes one pair forms the pectoral girdle and the other forms the pelvic girdleWhich of the following occurs to the blastocoel during Xenopus development? is replaced by the expanding archenteron becomes the archenteron gives rise to the mesoderm gives rise to the endoderm
- What is the third layer that forms as a result of gastrulation in some animals? mesoderm endoderm ectoderm three layers never form during gastrulation in any animal. Draw and label parts of whole mount of chick embrogenesis specimens of the following stages: Primitive Streak Head formation Flexion and Torsion: Stage 13 Flexion and Torsion: Stage 16 Early Somite: Stage 7 Early somite: Stage 10 Limb-bud: Stage 19 Limb-bud: Stage 21Ectodermal Derivatives of the Developing Chick Embryo 33-hour Chick Embryo Transverse Sections 48-hour Chick Embryo Transverse Sections (SEE IMAGE) 72-hour Chick Embryo Transverse Sections Several new structures appear at this stage of development. However, there are also parts that remained essentially unchanged since the 48-hour stage. Go through them very quickly. Epidermis: This epidermal ectoderm derivative is the outermost covering of the embryo. Nervous System Quickly identify again these principal structures from the whole mount. The first sections will show the rhombencephalon in a frontal section due to increased cephalic or cranial flexure in the 72-hour chick embryo. Rhombencephalon: Metencephalon: The anterior portion of the hindbrain has thicker walls than the myelencephalon. The roof becomes the cerebellum and the ventro-lateral walls become the pons. The cavity is the metacoel. It comes from neuromere 6. Myelencephalon: This is the thin-roofed posterior region of…