Recombinant DNA Technology
Knockout mice are created by

infecting the mouse with a retrovirus
creating a chimera by fusing cells from two different cell lines
mutagenizing a mouse and selecting for mutant offspring
transfecting embryonic stem cells with an altered gene sequence

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Recombinant DNA Technology
Isoschizomers recognize

different recognition site and different recognition sequence
same recognition site and different recognition sequence
same recognition sequence but different recognition site
same recognition site and recognition sequence

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