II. Questions for Research. (Provide your reference/s) 1. What is a blastoderm? How is this part associated with area pellucida and area opaca? What is area vitellina? 2. In 33-hour chick embryo, brain segments are already evident. Identify these brain segments and give the function of each segment by creating a table. Brain segments (33-hour chick embryo) Function/s 3. Which part of the adult structures are derived from blood islands? 4. In 48-hour chick embryo, cranial flexure appears. Identify the boundaries covering the cranial and cervical flexures. 5. How does ectodermal derivatives develop in 48-hour chick embryo compared to 33-hour chick embryo? 6. What are the distinguishable parts of the 72-hour chick embryo? Give at least 5 parts and the adult derivatives of each part. 7. What happens in the head and tail folds of the 72-hour chick embryo? What is its significance? 5
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- Area pellucida: The area pellucida is the central clear region of the blastoderm. - Area opaca: The area opaca is the peripheral opaque region surrounding the area pellucida. - Area vitellina: The area vitellina is the region of the yolk sac that surrounds the Show more…
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Consider development in the chick. Match each of the following terms to its definition: During gastrulation, epiblast cells migrate inward through this structure. A flat disc of cells produced by cleavage. Blocks or balls of epimere mesoderm - each body segment in the trunk region has one pair of these. The anterior end of the primitive streak - this structure moves from anterior to posterior, closing the primitive streak. The cells of the blastodisc form two layers - this is the ventral layer. This layer of cells guides the migration of epiblast cells during gastrulation. These cells separate from the neural folds during neurulation. The cells of this type of ectoderm can migrate independently throughout the embryo. This is the space located between the epiblast and the hypoblast. Loosely associated, undifferentiated mesodermal cells that can migrate independently throughout the embryo.
Dominador T.
17. Look into the slide of 33 h chick embryo A) Which organs are going to develop from the somites? a. Muscles b. Neural tube Answer____ B) From which germ layer is the spinal cord developed? a. Mesoderm b. Ectoderm c. Endoderm Answer____
Adi S.
4. Fill in the table below with the number of somite pairs you can see in the chick embryo slides: Stage # Somite Pairs 5. List some physical characteristics that the chick embryos have in common. 6. Which of the embryos you observed most closely resembles the adult chick form? Why? 7. What is the purpose of each of the following structures in late human development? a. Chorion – b. Amnion/amniotic fluid – c. Umbilical cord – d. Placenta –
Sri K.
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