Discussion
In forensic examination of samples, STR are selected which are :
Answer: B
Forensic STR loci are chosen to be genetically not linked.
The strength of a DNA profile comes from multiplying the frequencies of the alleles at each locus (the product rule). That multiplication is valid only if the loci are inherited independently of one another, which requires them to lie on different chromosomes or far apart on the same one.
Linked loci are inherited together, so multiplying their frequencies would overstate the rarity of a profile. Size matters for other reasons, such as using shorter amplicons for degraded DNA, but it is not the selection rule the question asks about.
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