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Abstract:
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In the New World, all existing Apis mellifera (honey bees) are introduced from existing (different) populations in the Old World. One effect of this is the prevalence of European honey bees in the north and African "killer" honey bees in south (these frighten some by moving). Using 1136 SNPs genotyped in 341 individuals, Whitfield et al. (2006) characterized both native and introduced populations of honey bees over time. In their paper, they clustered native genomes into four genetic classes, and then compared introduced genomes to these clusters to measure the change in the honey bee gene pools in the Americas over time. We propose a mixed membership model for honey bee genomes where any particular bee's genome is a mixture of several pure types. Using a Dirichlet process prior, we can estimate the true number of pure types along with the mixture in each of the observed individuals.
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