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During telophase, when new daughter cells form how do they "know" what type of cell they will become?
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We are currently studying gene switches and natural selection in my class. My students and I do not fully understand what actually turns the switches on and off.
For example, in the stickleback fish. What caused the gene to be turned off. Is it something environmental?
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Please explain the mechanism by which a species that is drifting genetically
to become a new species reorganizes its DNA on its chromosomes, creating a
new number of chromosomes or putting the information in a new arrangement.
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Dr. DeRisi’s Virochip technology lowers the cost of doing business. How does Dr. DeRisi see his tool changing the way viral research is carried out? For example, viral life cycle, demographic virus reserve pool, and many more types of research might now be possible on a wide scale.
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By what percentage do the DNA sequences of two humans differ? What are the mean and standard deviation of the distribution of pairwise DNA-sequence differences between two random human beings?
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Can you explain the genetics and evolution of skin color? Is skin color useful for grouping people into ethnic groups? |
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What will happen if you put chicken genes into humans? Will we grow feathers? Have beaks? If you put horse DNA into a fish, will it grow hooves? |
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Why is the allele for sickle cell anemia considered recessive if it expresses itself, even though incompletely, with the normal allele in heterozygotes? |
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Is there any difference between plant and animal DNA, for example, in structure, chemistry, function, or nomenclature? |
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My students are thinking there must be errors during transcription and translation. We don't see any mention of that in our text and other sources. Is there "proofreading" for these processes? Do we pay no attention to these types of errors because they would have only a one-time impact that is not measurable?
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