Homework Answers
As the embryo forms, its overall body pattern is determined by the establishment of three clear axes—the anterior-posterior axis (head-tail), the dorsal-ventral (back-belly) axis, and left-right asymmetry. Anterior-posterior axis develops from the animal vegetal axis which originates during oogenesis. Dorsal ventral axis is established after fertilization just before the first cleavage. Yolk protein accumulates in the vegetal half and cortical cytoplasm of animal half accumulates dark pigment.
If eggs are rotated toward the end of the first cell cycle so that the future ventral side is upward, two Nieuwkoop centres are formed, leading to two dorsal blastopore lips and two embryonic axes. Therefore, the specification of the dorsal-ventral axis begins at the moment of sperm entry.
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Animal Development Explain the role of fertilization in the process of axis formation in amphibians.
1) List and describe the steps of animal development from zygote to the gastrula 2) Describe...
1) List and describe the steps of animal development from zygote to the gastrula 2) Describe the process of neurulation 3) Describe the process of axis formation
The process of double fertilization in the gymnosperms results in Select one: , the 2n zygote...
The process of double fertilization in the gymnosperms results in Select one: , the 2n zygote b. the megagametophyte tissue c. the seed coat d. double fertilization is not found in the gymnosperms The vascular plants have two synapomorphies that define them. One is vascular tissue and the other is: Select one: a. chlorophyll b c. diploid-dominant life cycle d. oögamy Plant cell mitosis differs from animal cell mitosis in the formation of a structure that aids in the development...
(1) Explain the specific role of homeotic genes in controlling animal development; what specific aspect of...
(1) Explain the specific role of homeotic genes in controlling animal development; what specific aspect of development is controlled by homeotic genes, and how do they achieve this? (5 pts) (ii) Explain why a mutation to a homeotic gene can be an important macroevolutionary event. Your response should include a clear discussion of what macroevolution means and the type of evolutionary change associated with macroevolution (as opposed to microevolution), and why mutations to homeotic genes can result in macroevolution. (6...
Explain what happens in the cell after fertilization. label the steps in the development of an...
Explain what happens in the cell after fertilization. label the steps in the development of an organism
Pick one early developmental process (fertilization, cleavage, gastrulation or any axis specification)
Pick one early developmental process (fertilization, cleavage, gastrulation or any axis specification) and COMPARE and CONTRAST this process between one INVERTEBRATE model organism with one VERTEBRATE model organism.
please explain the fertilization process of the zebra fish, be sure to include the effect that...
please explain the fertilization process of the zebra fish, be sure to include the effect that the actual fertilization event has on subsequent cleavage and gastrulation in the model.
Explain the role of phase equilibria in microstructural development. Based on the process you have described,...
Explain the role of phase equilibria in microstructural development. Based on the process you have described, explain what is happening to the structure of the C 26000 Brass( Copper alloy 260) a. Which phases are present and how were they affected/formed by the processing? Are these equilibrium phases? Metastable phases? Microconstituents? b. What are the crystal structures of the phases present? Please write as particular as possible, thanks
Discuss and apply the OD process to alliance formation and development.
Discuss and apply the OD process to alliance formation and development.
10.Development of axes: animal-vegetal, anteroposterior, dorso-ventral; their fixing during specific stages of development 11. Alternative pathway...
10.Development of axes: animal-vegetal, anteroposterior, dorso-ventral; their fixing during specific stages of development 11. Alternative pathway of development 12. Differentiate between techniques: heterochronic transplantation, clonal analysis, heterotopic transplantation, isolation 13. Bottle cells and blastopore 14.Differentiate : coelom, archenteron, blastocoel, blastopore, primitive groove 15. Definitions: migration, invagination, intercalation, ingression, epiboly, involution, convergent extension, delamination 16. Patterns of gastrulation in different groups of animals 17. Definition of Neurulation 18. Compare neurulation in Birds and in Amphibians
What role do phases, of the development process, serve when working to manage custom software development?...
What role do phases, of the development process, serve when working to manage custom software development? If possible, please feel free to provide examples.
The process of double fertilization in the gymnosperms results in Select one: , the 2n zygote b. the megagametophyte tissue c. the seed coat d. double fertilization is not found in the gymnosperms The vascular plants have two synapomorphies that define them. One is vascular tissue and the other is: Select one: a. chlorophyll b c. diploid-dominant life cycle d. oögamy Plant cell mitosis differs from animal cell mitosis in the formation of a structure that aids in the development...
(1) Explain the specific role of homeotic genes in controlling animal development; what specific aspect of development is controlled by homeotic genes, and how do they achieve this? (5 pts) (ii) Explain why a mutation to a homeotic gene can be an important macroevolutionary event. Your response should include a clear discussion of what macroevolution means and the type of evolutionary change associated with macroevolution (as opposed to microevolution), and why mutations to homeotic genes can result in macroevolution. (6...
10.Development of axes: animal-vegetal, anteroposterior, dorso-ventral; their fixing during specific stages of development 11. Alternative pathway of development 12. Differentiate between techniques: heterochronic transplantation, clonal analysis, heterotopic transplantation, isolation 13. Bottle cells and blastopore 14.Differentiate : coelom, archenteron, blastocoel, blastopore, primitive groove 15. Definitions: migration, invagination, intercalation, ingression, epiboly, involution, convergent extension, delamination 16. Patterns of gastrulation in different groups of animals 17. Definition of Neurulation 18. Compare neurulation in Birds and in Amphibians
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