Romney only American family with 5 generations of no military service?

[2on2u]

53. An utter lack of patriotism or a genetically induced propensity for fear.

http://www.ncbi.nlm.nih.gov/pubmed/12860774

RESULTS:

All components of the fear conditioning process in humans demonstrated moderate heritability, in the range of 35% to 45%. Best-fitting multivariate models suggest that 2 sets of genes may underlie the trait of fear conditioning: one that most strongly affects nonassociative processes of habituation that also is shared with acquisition and extinction, and a second that appears related to associative fear conditioning processes. In addition, these data provide tentative evidence of differences in heritability based on the fear relevance of the stimuli.
CONCLUSION:

Genes represent a significant source of individual variation in the habituation, acquisition, and extinction of fears, and genetic effects specific to fear conditioning are involved.