The expression of maternal-effect genes directly leads to a. the establishment of body axes. b. segmentation. c. determination. d. cell differentiation.
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The expression of maternal-effect genes directly leads to
a. the establishment of body axes.
b. segmentation.
c. determination.
d. cell differentiation.
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- The expression of homeotic genes leads to a. the establishment of body axes. b. the formation of segments in the embryo. c. the determination of structures within segments. d. cell differentiation.What is the molecular explanation for maternal effect?a. The father’s gene is silenced at fertilization.b. During oogenesis, nurse cells transfer gene products to theoocyte.c. The gene products from nurse cells are needed during thevery early stages of development.d. Both b and c are correct.Carefully distinguish between the terms differentiation and determination. Which phenomenon occurs initially during development?
- During development, cells become a. differentiated before they become determined. b. determined before they become differentiated. c. determined by the loss of genetic material. d. differentiated by the loss of genetic material.Early pregnancy tests used antibodies to detect the presence of human chorionic gonadotropin (hCG) in maternal urine. Explain how hCG, produced by the chorion, gets in maternal urine.Which of the following statements is not true about the placenta? A. It provides exchange of wastes and nutrients between the mother and the fetus. B. It develops by the third month of gestation. C. It allows transfer of maternal immunoglobulin D. It allows passage of bacteria and virus. -Provide explanation
- Why is it easier to manipulate embryonic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell? a. As cells develop, signaling pathways can cause some genes to be turned off during development. b. Adult cells have different DNA content than do embryonic stem cells. c. Emybronic stem cells pose less of a threat for organ rejection as do an individual s own adult cells. d. It is no easier to manipulate emybronic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell.Discuss the concepts of: "MORPHOGENESIS" Also, cite examples to illustrate these concepts.List and briefly describe the four stages that are thoughtto have led to the formation of the first cells.
- The toolkit genes generally regulate_____ [A]_____ in order to direct development. Other developmental decisions are regulated _____[B]_____, as we saw in sex determination in flies. *Hint: these are steps in the Central Dogma? Give typing answer with explanation and conclusionWhy does a mouse embryo develop faster than a human embryo, for example?Which of the following characterizesparthenogenesis?(A) An individual may change its sex during itslifetime.(B) Specialized groups of cells grow into newindividuals.(C) An organism is first a male and then a female.(D) An egg develops without being fertilized.