Textbook Question
A cell that begins mitosis with 46 chromosomes produces daughter cells with chromosomes.a. 13;b. 23;c. 46;d. 92
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3. Energy & Cell Processes
Introduction to Cell Division
3:23 minutesProblem 13
Textbook Question
SCIENTIFIC THINKING Each scientist works as part of a broader community of scientists, building on the work of others. Scientific advances often depend on the application of new technologies and/or on new techniques applied to an existing problem. What improvements to existing cloning methods did Wilmut make that allowed him to successfully clone Dolly the sheep from an adult cell?
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Identify the previous limitations in cloning technology: Before Dolly, cloning from adult cells was largely unsuccessful due to the inability to reprogram mature cells to an embryonic state.
Understand the role of somatic cell nuclear transfer (SCNT): Wilmut's team used SCNT, where the nucleus of an adult somatic cell is transferred into an enucleated egg cell.
Recognize the importance of cell cycle synchronization: Wilmut synchronized the cell cycles of the donor nucleus and the recipient egg to increase the chances of successful development.
Acknowledge the use of starvation to induce quiescence: Wilmut's team starved the donor cells to bring them into a quiescent state, making them more likely to be reprogrammed successfully after transfer.
Explore the role of electric pulses: Electric pulses were used to fuse the donor cell with the enucleated egg and to stimulate the egg to begin dividing, leading to the development of an embryo.
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3mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Somatic Cell Nuclear Transfer (SCNT)
Somatic Cell Nuclear Transfer is a cloning technique where the nucleus of a somatic cell is transferred into an enucleated egg cell. This method was pivotal in cloning Dolly the sheep, as it allowed the use of a differentiated adult cell, demonstrating that adult cells could revert to a pluripotent state and develop into a complete organism.
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Differentiation and Reprogramming
Differentiation refers to the process by which a cell becomes specialized for a specific function. In the context of cloning, reprogramming is the ability to revert a differentiated adult cell back to a state where it can develop into any cell type. Wilmut's work showed that adult cells could be reprogrammed to support embryonic development, which was crucial for the success of cloning.
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Cell Culture Techniques
Cell culture techniques involve growing cells under controlled conditions, typically outside their natural environment. Wilmut improved these techniques to ensure that the donor cells were healthy and viable for the cloning process. This included optimizing the conditions for the somatic cells to maintain their integrity and functionality before being used in SCNT.
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