QUESTION 5 Match the term to the correct description. + Blastomeres A. Small cells formed during cleavage * Blastula B. Where yolk is concentrated in frog embryos C. Site of the blastocoel in animal embryos + Blastocoel D. Fluid-filled cavity surrounded by the blastula + Vegetal pole E, A hollow ball of cells * Animal pole
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- Match the 3 germ layers with the specific structures they will develop into. Question 10 options: A musclular and skeletal systems B digestive system, liver, pancreas C nervous system D circulatory system, epithelial layers of the lungs E inner layer of the lungs F skin, nails, hair 1. Ectoderm 2. Mesoderm 3. EndodermQuestion 6 Which is true about oogenesis? a. The process of oogenesis occurs in the uterus Ob. The process begins with primitive stem cells called microglia Oc. They become encapsulated in tissue and form the ridges in the uterus O All of the choices are correct O None of the choices are correct uring spermatogenesis.Answer the following questions briefly (3-5 sentences only). 1. Why does oxygen consumption increase during gastrulation? 2. What is the purpose of applying tiny particles of carbon to the surface of the embryo? 3. What processes cause the change in the form of the embryo during gastrulation 4. Does the environment play a role in the movement of cells? 5. Why is the nuclei of the early cleavage cells considerably larger than they are in ordinary somatic cells?
- What are the significance of ORGATOGENESIS. State whether it is a normal developmental phenomena or not, support your answer.Evaluate the following statements and choose the incorrect ones: Granulosa cells secrete progesterone to form zona pellucida around the primary oocyte. I. II. Spermatogonia divide by mitosis to give two identical cells cells. One of these replenishes the spermatogonia. II. Sertoli cells affect the developing sperm. IV. Primordial germ cells colonise the cortex of the primordial gonad and replicate by mitosis. Statements Il and II Statements IV and II Statements I and III Statements II and OptionIDENTIFICATION (Developmental Biology) Question #1. Refers to the arrangement of the mitochondria, golgi apparatus, yolk, and pigment granules. Question #2. It shows the organ forming tissues.
- The 48-hr Chick Embryo Whole Mount (SEE IMAGE) Before you mount your slide on your microscope stage, take a good look at the morphology of the 48-hour embryo. Note the striking changes in morphology as compare, to the 33-hour embryo. There is a cephalic flexure or bending at the level of the midbrain. The head now lies on its left side. On the other hand dorsal side of the trunk is still turned up so the twisting of the embryo is noticeable. Verify these changes under the low power objective. Note the flexion and the torsion. In addition to the cranial/cephalic flexure there is also a cervical flexure at the level of the neck region. Very briefly go through the structures previously seen in the 33-hour chick. Observe the new structures appearing for the first time (Please visit the main website for viewing the whole mount of 33-hour and 48-hour chick embryo). Ectodermal Derivatives The prosencephalon is now divided into two regions: Telencephalon: This brain region is the anterior…Answer the following questions. 1. Where does a sea star embryo get its nutrition during prelarval stages of development? 2. More recently evolved organisms have modified the stages of embryological development. Would you expect early or late stages to be modified the most? Why? 3. The basic stages of embryological development are remarkably similar for a wide range of organisms. How would you explain such consistency? 4. As cells invaginate and move about, do they “know” where they are? If not, how is movement controlled? If so, how do they perceive their position?The 48-hr Chick Embryo Whole Mount (SEE IMAGE) Before you mount your slide on your microscope stage, take a good look at the morphology of the 48-hour embryo. Note the striking changes in morphology as compare, to the 33-hour embryo. There is a cephalic flexure or bending at the level of the midbrain. The head now lies on its left side. On the other hand dorsal side of the trunk is still turned up so the twisting of the embryo is noticeable. Verify these changes under the low power objective. Note the flexion and the torsion. In addition to the cranial/cephalic flexure there is also a cervical flexure at the level of the neck region. Very briefly go through the structures previously seen in the 33-hour chick. Observe the new structures appearing for the first time (Please visit the main website for viewing the whole mount of 33-hour and 48-hour chick embryo). Ectodermal Derivatives The prosencephalon is now divided into two regions: Telencephalon: This brain region is the anterior…
- The 48-hr Chick Embryo Whole Mount (SEE IMAGE) Before you mount your slide on your microscope stage, take a good look at the morphology of the 48-hour embryo. Note the striking changes in morphology as compare, to the 33-hour embryo. There is a cephalic flexure or bending at the level of the midbrain. The head now lies on its left side. On the other hand dorsal side of the trunk is still turned up so the twisting of the embryo is noticeable. Verify these changes under the low power objective. Note the flexion and the torsion. In addition to the cranial/cephalic flexure there is also a cervical flexure at the level of the neck region. Very briefly go through the structures previously seen in the 33-hour chick. Observe the new structures appearing for the first time (Please visit the main website for viewing the whole mount of 33-hour and 48-hour chick embryo). Ectodermal Derivatives The prosencephalon is now divided into two regions: Telencephalon: This brain region is the anterior…The 48-hr Chick Embryo Whole Mount (SEE IMAGE) Before you mount your slide on your microscope stage, take a good look at the morphology of the 48-hour embryo. Note the striking changes in morphology as compare, to the 33-hour embryo. There is a cephalic flexure or bending at the level of the midbrain. The head now lies on its left side. On the other hand dorsal side of the trunk is still turned up so the twisting of the embryo is noticeable. Verify these changes under the low power objective. Note the flexion and the torsion. In addition to the cranial/cephalic flexure there is also a cervical flexure at the level of the neck region. Very briefly go through the structures previously seen in the 33-hour chick. Observe the new structures appearing for the first time (Please visit the main website for viewing the whole mount of 33-hour and 48-hour chick embryo). Ectodermal Derivatives The prosencephalon is now divided into two regions: Telencephalon: This brain region is the anterior…Question 4 Put the following events of neurulation in order, from first to last. Notochord signals ectoderm layer at top of v[Choose] embryo to form a neural plate Cells in the neural plate change shape, causing the neural plate to bend and form the neural groove. 4 3 The two sides of the neural plate come [ Choose ] together, forming a neural crest The neural tube pinches off by coming [Choose ) unglued from the neural crest The neural tube becomes the spinal cord and brain in the body and head, respecțively. [ Choose )