33. In words and/or a diagram, describe the molecular components of the developmental timing mechanism responsible for the formation of somites of the proper size and placement within the chick embryo. Make sure to include in your answer how the molecular components are coordinated by growth of the embryo to control somite formation How could this developmental timing mechanism be manipulated to produce longer somites could this developmental timing mechanism be manipulated to increase the rate of somite production ( ? How ,?

33. In words and/or a diagram, describe the molecular components of the developmental timing mechanism responsible for the formation of somites of the proper size and placement within the chick embryo. Make sure to include in your answer how the molecular components are coordinated by growth of the embryo to control somite formation How could this developmental timing mechanism be manipulated to produce longer somites could this developmental timing mechanism be manipulated to increase the rate of somite production ( ? How ,?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter50: Animal Development

Section: Chapter Questions

Problem 4TYK

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Similar questions

1. During oogenesis, oogenetic inhibitors must be deactivated after full growth to allow the a. oogonium to undergo mitosis. b. ootid to transform into a zygote. c. primary oocyte to complete the first meiotic division. d. secondary oocyte to complete the second meiotic division. 2. Which of the following layers protect the mammalian oocyte during ovulation? * a. cortical and hyaline layers. b. vitelline envelope and jelly coat. c. granulosa cells and zona radiata. d. corona radiata and zona pellucida. 3. After ovulation, the following cells are transformed to lutein cells EXCEPT * a. theca cells. b. corona radiata cells. c. cumulus oophorus cells. d. stratum granulosum cells.
If an embryo splits at the two-cell stage, each of the resulting identical twins will have its own placenta. If such a split occurs near the time of implantation, the identical twins may shale a placenta. By contrast, fraternal twins never share placenta. Explain this difference between the two types of twins.
In the embryonic development of the eye: a. the optic vesicle cells permanently adhere to each other to prevent movement, whereas the optic cup cells are very motile. b. the optic cup induces the surface ectoderm to form the lens placode. c. gradients determine that the ectoderm overlying the lens vesicle develops into the optic vesicle. d. microtubules powered by myosins and microfilaments powered by dyneins move the eye components around in the head region. e. cadherins function in the presence of calcium to allow the lens placode and optic cup to break apart.
Discuss Concepts Arguably, in sexually reproducing animals, development begins when eggs and sperm form in the parents. In a paragraph, explain the rationale for this idea.
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The timing of puberty can be influenced by which of the following? genes stress amount of body fat all of the above
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5. Outline the events of oogenesis. Why is oogenesis a significant process for egg production
8. Compare and contrast animals with external fertilization to those with internal fertilization. What structures and/or behaviors would you expect to find in each type? What are the difference(s) in gamete production between the two types?
1. Why is it necessary for the egg to have changes leading to polyspermy block during fertilization? Discuss thoroughly and do no just copy from somewhere, please.
What are morphogens, exactly? Explain how they affect the patterning of tissue throughout embryonic development. Give 4 concrete instances to back up your claims.
In-vitro fertilization occurs in the laboratory. The resulting embryos remain in a laboratory culture for up to six days before being transferred to the potential mother. If fertilization had occurred naturally (i.e., inside the female reproductive system instead of in-vitro), where would the embryo be and what developmental processes would it be undergoing during those first six days of development?