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Answer the following questions:
1. How are twins derived?
2. Describe a monozygotic and dizygotic twins.
3. Draw and label the parts of Gastrulation, Neurulation and the Migration of Neural Crest Cell
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- Label the early development stages shown in the following diagram.Discuss the following terms in detail 1. Fertilization 2. Cleavage 3. GastrulationMatch the terms in column A with the descriptions in column B. Column A a. blastocystb. chorionic villic. ectodermd. endoderme. mesodermf. morulag. trophoblastColumn B 1. germ layer that gives rise to muscle and bone tissues2. hollow ball of cells3. cells forming wall of blastocyst4. solid ball of about sixteen cells5. inner germ layer of embryonic disk6. slender extensions that grow out from the trophoblast7. outer germ layer of embryonic disk
- Discuss the following terms in detail: 1.1 Fertilisation 1.2 Cleavage 1.3 Gastrulation 1.4 Animal developmentDraw and label the following parts: (a) membrane coverings of gonads (b) supporting cells of gonad (c) gametogonia at various stages of maturation (d) blood vessels, nerves, etc. Table 1: Panoramic view of Gonads Testis OvariesAnswer 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?
- 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. EndodermIdentify the three (3) differences between the frog and mammalian testis, and three (3) differences between the frog and mammalian spermatogenesis. Testis Characteristics Frog Mammal 1. 2. 3. Spermatogenesis Frog Mammal 1. 2. 3.Please answer the following: 1.Identify the changes in sensitivity that occur in the hypothalamus, pituitary and gonads as a boy or girl approaches puberty. Explain how these changes lead to the increases of sex steroid hormone secretions that drive many pubertal changes. 2.Explain how the internal female and male reproductive structures develop from two different duct systems. 3.Explain what would occur during fetal development to an XY individual with a mutation causing a nonfunctional SRY gene.