IL-4 responsible for class switch recombination (CSR) into,

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#Question id: 1596

#SCPH28 | Zoology

Which one of the following is function of Class III MHC genes?

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#Question id: 5077

#I Life Science/ Life Sciences Group – I-V

Humans and mice heterozygous for loss-of-function mutations in Pax6 have:

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#Question id: 19686

#SCPH06 I Botany

Where is atrial repolarization hidden in the ECG?

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#Question id: 13044

#SCPH05 I Biotechnology

How many different types of dNTPs are utilized in a reaction mixture when carrying out sanger’s DNA sequencing ?

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#Question id: 15654

#SCPH06 I Botany

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 basic genetic properties of the MelB– mutation?