For a protein to be expressed in milk of a transgenic animal, its gene should be under the control of the promoter of the gene coding for

Preproinsulin

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LacZ

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beta-globin

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beta-lactoglobulin

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Solution

The correct option is D
beta-lactoglobulin

For a gene product to be expressed in milk, the transgene should be incorporated within the control of the gene coding for β-lactoglobulin. β-Lactoglobulin is the major whey protein of cow and sheep's milk, and is also present in many other mammalian species; a notable exception being humans.

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For a protein to be expressed in milk of a transgenic animal, its gene should be under the control of the promoter of the gene coding for

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Column-I	Column-II
(A) Structural gene	(i) Binding site for a repressor protein
(B) Operator gene	(ii) Codes for a repressor protein
(C) Promoter gene	(iii) Induce lactose transport from the medium
(D) Regulator gene	(iv) Codes for protein enzyme
	(v) Binding site for RNA polymerase

β

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