Recombinant DNA Technology
Knockout mice are created by

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

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Recombinant DNA Technology
Which of the following is correct in terms of determination of location of genetic traits?

Restriction sites allow DNAs to be digested
Known protein coding sequences are too far apart to allow linkage determination for most new genes
None of these
Protein-coding genes are always associated with a restriction pattern

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