It may be due to the presence of low frequency
null alleles segregating at these loci as described by Peter et al.
These mismatches can be ascribed to the presence of allelic drop-out,
null alleles or high frequency of mutations resulting in 2-4 bp shifts.
The molecular basis of a microsatellite
null allele from the White Sands pupfish.
The
null alleles affect population parameters which are estimated based on the proportion of heterozygotes.
[22-24]detected different
null alleles, including Wx-A1.
Comparing these data and our results using a population of 60 Mexicans with chronic periodontitis, an increase in the frequency of the GSTM1
null allele to 55% is observed and our data indicate that the GSTT1
null allele is present at a frequency of 65%.
Taken together, the observations from the genetic crosses described above and the cuticle analyses suggest that the [hth.sup.CPTI000378] allele is not a
null allele and support the view that the [hth.sup.CPTI000378] lethality is likely due to a second site mutation.
All apparently homozygous undisputed mothers who had a different STR phenotype to their apparently homozygous children were counted as probable
null allele carriers.
2009), which suggests there may be
null alleles at these loci.
When Shriver, who considers himself to be white, analyzed his own DNA, he found that it contained the Duffy
null allele, found only in descendants of sub-Saharan Africans.