Several of the different globin genes are expressed in humans, but at different times in development. What mechanism could allow for this?

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#Question id: 32223

#Unit 2. Cellular Organization

What is the purpose of N-linked Glycosylation?

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#Question id: 23963

#Unit 8. Inheritance Biology

What type of gene mutation happens when there is loss of a chromosomal segment?

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#Question id: 28404

#Unit 5. Developmental Biology

Siamois and Twin transcriptional factor inducing the activation of the neuroepithelium genes, these genes are____

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#Question id: 7158

#Unit 5. Developmental Biology

If the nerve supply to a newt limb is severed before amputation, how will this affect regeneration?

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#Question id: 15655

#Unit 13. Methods in Biology

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. Next you isolate a mutation, designated MelB–, which gives uninducible melibiase activity. Mapping experiments show that MelB– is linked to Mel1. Using an F' factor that carries the chromosomal region surrounding Mel1, you perform the following genetic tests:

 

Describe the proposal for the type of regulatory functions affected by the MelB– mutation.