We should isolate the gene from the blastocyst cell. Now fused this gene with fluorescent gene reporter. Now insert this gene in the blastocyst cell. Find the recombinant ones from non recombinant ones by seeing the expression of fluorescent gene expression in the cell And allow the blastocyst to divide. The blastocyst give rise to whole body. That's why there is found fluorescent gene in all the body of the cells.
Since the body has fluorescent gene. The germ cells also have this fluorescent gene. It will produce gametes which have the fluorescent gene. In this way, the fluorescent gene becomes heritable in nature.
please look in the image for diagrammatic explanation:
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