STATEMENT OF FACTS - University of Illinois Springfield

interrelated and that this interrelation caused a departure from the Hardy-
Weinberg Equilibrium concerning independency. (Vol. LXXI, R. 13)
When there is this type of departure from the equilibrium there is a higher
likelihood that you will have matching alleles. (Vol. LXXI, R. 14) Basten believes
that the interrelatedness of dogs needs to be taken into account and that a
correction factor should be applied to the database. (Vol. LXXI, R. 15)
In the present case, Basten applied his methodology to the results arrived
at by Halverson to take into account the inbreeding aspect of the canine DNA
database. (Vol. LXXI, R. 16-17) His results showed that the evidence is 167 times
more likely that Senior’s dog Cagney is the source rather than another dog. (Vol.
LXXI, R. 20-21) He then calculated the general frequency of the population and
determined that the likelihood of a match was one in 1,680. (Vol. LXXI, R. 21)
On cross-examination, Basten said that DNA testing is generally accepted
in his scientific community for human and canine application. (Vol. LXXI, R. 34)
When making his calculations he resorted to the work of Dr. Bruce Weir who has
a distinguished career in population and statistical genetics. According to Weir’s
work, a likelihood ration of 167 strongly supports the proposition that Cagney was
the source of the hair. (Vol. LXXI, R. 35-37)
Basten admitted that when he made his calculations he did not know that
Senior’s dog, Cagney, was not a purebred dog. (Vol. LXXI, R. 39) It was explained
that the 167 ration is still the best calculation available because there is no
central Illinois canine database. (Vol. LXXI, R. 40) He stressed that knowledge
of Cagney being a mix-breed would not have changed his statistics because he can
only use this particular data set and theta. However, if he had a mixed-breed data
base it could have changed the calculations significantly. (Vol. LXXI, R. 39-40)
The database he used was from the west coast and there is no Midwest database.
(Vol. LXXI, R. 43) He has no knowledge of the rate of inbreeding in Illinois;
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