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

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

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Recombinant DNA Technology
Some genetic diseases cannot be diagnosed by changes in restriction sites. Some of these can be detected by allele-specific oligonucleotide probes. These are

mutagenized copies of a gene
PCR-amplified variable numbers of tandem repeats (VNTRs)
copies of the gene with an altered sequence so that a restriction site is inserted
short sequences that will hybridize only to a specific base sequence

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