Variant 3 (Cytology and Embryology)

Please, write your name and group Task 1. Draw structure of the nucleolus. Please, draw schematic structure (according with lecture and practice). Explanation and function Task 2. Draw types of cleavage. What does the type of cleavage depend on? Please, draw schematic structure (according with lecture and practice). Explanation Task 3 a. Identify and designate structures Write the name at the top of the diagram stages of fertilization nucleus sperm tuberculum of fertilization stage of contact interaction stage of penetration female pronucleus male pronucleus centriole stage of syncarion female pronucleus male pronucleus methaphase female chromasomes male chromasomes Task 3 b. Identify and designate structures Write the name at the top of the diagram frog blood nucleus Task 3 c. Identify and designate structures Write the name at the top of the diagram cilia axonema basal body Task 4 a. What are Sudan stains used primarily for? Blood Fat Nervous tissue Elastic fibers Decalcified bone matrix Task 4 b. A histological specimen shows a blastula with a single-layer blastoderm, a blastocell in the center. Determine what type of cleavage leads to the formation of such a blastula? What will be the mechanisms of gastrulation? Cleavage in the lancelet is completly, evently, synchronous. The zygote is divided into blastomeres of approximately the same size. The result of cleavage is the formation of a uniform celloblastula - a spherical embryo with a cavity inside and a wall formed by one layer of blastomeres of approximately the same size. In the lancelet, gastrulation occurs by simple protrusion - invagination - of the vegetative part of the blastula into the blastocell. Task 4 c.Where is the site of protein synthesis? Peroxisome Ribosomes Nucleoli Centrioles Microfilaments Task 5 a. Recognize and designate Please, write of slid's name on a top of picture golgi apparatus nucleus with nucleolus golgi apparatus Task 5 b. Recognize and designate Please, write of slid's name on a top of picture discoblastula discoblastula