Virtually all steps of embryological development depend on: a. Alterations in the genome b. Tumor Stem Cells c. Changes in programs of gene expression d. Telomerase
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Virtually all steps of embryological development depend on:
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- Carefully distinguish between the terms differentiation and determination. Which phenomenon occurs initially during development?Which of the following best describes the concept of cell differentiation during the development of a multicellular organism? A. During development, all of the genes in the embryo's cells are expressed at first, but fewer and fewer are expressed as time proceeds. B. During development, different sets of genes are deleted from different cell types so that at the end of development, each cell has only the genes it needs. C. During development, different cells become specialized to have different phenotypes even though they all originated from the same cell. ..Discuss the role of homeotic genes in development. Explain what happens to the phenotype of a fruit fly when a gain-of-function mutation in a homeotic gene causes the protein to be expressed in an abnormal region of the embryo. What are the consequences of a loss-of-function mutation in such a gene?
- A cytoplasmic determinant can control development at the early stages of development because....? Group of answer choices a. it is a universal activator of all genes b. it is present evenly throughout the cytoplasm c. it is activated by cell division d. it is controlled by genes present in the cytoplasm e. it is laid down in the egg cell by the motherIs it moral to do stem cell research on embryos? Cite moral and ethical reasons, can you give an alternative?Developmental abnormalities can result from: 1. Under expression of some genes 2. All of these choices are correct 3. Inappropriate interaction among gene products that were expressed in the wrong amounts and wrong time 4. Over expression of some genes 5. corrupted timing of the normal time genes are expressed
- Explain how cellular differentiation and morphogenesisplay a role in development.What statement best describes the difference between "fate maps" and "specification"? If cells are transplanted from their normal region in an embryo to a different region in a recipient embryo, such cells will alter their fate, but not their specification. Cell fate map describes the allocation of cells to the germ layers, ectoderm, mesoderm, or endoderm, whereas specification describes the exact tissues that each cell will ultimately become. The fate map of an embryo does not change during development -- the fate map of an egg is the same as the fate map of a late blastula -- whereas the specification map of an embryo changes continually as the embryo's development proceeds. The fate map of a cell is determined by labelling that cell and following it during normal development, whereas the specification state of a cell is determined by culturing a cell in an artificial medium and observing what tissues form from it.Describe the role of master regulators in embryonic development
- Identify Genes Required for Specific Developmental ProcessesThe following are various developmental phenomena relating to the concepts and principles in developmental biology. A. Concept of apoptosis B. Concept of prefomed guidelines C. Concept of programmed gene action D. Concept of capacity E. Concept of fate F. Concept of environmental influences G. Concept of induction H. Concept of progressively formed guidelines I. Concept of Differentiation J. Concept of guidelines K. Concept of Gradient L. Concept of differentiation Question #1. During the cleavage stage, the masked messenger RNA from the developing oocyte controls the cleavage patterns. During the blastula stage, specific genes are activated; hence there is appearance of new proteins. What concept? Question #2. Catfish collected in the polluted waters of Pampanga River were found to have ruptured and vascularized brain. What concept? Question #3. Stem cell technology is based on the principle that an undifferentiated cell is totipotent. What concept?The following are various developmental phenomena relating to the concepts and principles in developmental biology. A. Concept of apoptosis B. Concept of prefomed guidelines C. Concept of programmed gene action D. Concept of capacity E. Concept of fate F. Concept of environmental influences G. Concept of induction H. Concept of progressively formed guidelines I. Concept of Differentiation J. Concept of guidelines K. Concept of Gradient L. Concept of differentiation Question #1. The intestine is derived from the endoderm. What concept? Question #2. Metamorphosis in frog. What concept? Question #3. An endodermal cell taken from a late gastrula stage grafted in the region of the ectoderm developed into stomach. What concept?