The genetic marker D1S80 that you examined in the fingerprinting lab experience

Question

The genetic marker D1S80 that you examined in the fingerprinting lab experience is a locus that has a variable number of tandem repeats of the same 16 base pair (bp) sequence. The primers that you used for PCR are described in question #17 above and are NOT the same as the primers used in the lab exercise. On the gel for the fingerprinting lab you see two bands for your sample: one band is 280 bp and one is 456 bp.

a) Are you homozygous or heterozygous?

b) How many tandem repeats are present in each band?

280 bp band ______ tandem repeats
4567 bp band ____ tandem repreats

Explanation / Answer

The answer is Heterozygous, because if it is homozygous we may get one band with either 280bp or 456bo.

The tandam repreats are in 280 bp is 17 and

in 456 band is 28.

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