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Data on sets of related individuals provide information about
the genetic mechanisms underlying the data. Related individuals
may carry genes that are copies of a gene in a common ancestor.
This gene identity-by-descent (ibd), and the probabilities with
which such ibd occurs, are fundamental to explaining patterns
of similarity among relatives. This talk will introduce some of
the basic ideas of gene ibd, the computation of probabilities on
sets of related individuals, and the inferences that can be made
from observed data.
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