A SEP IRA (Simplified Employee Pension) is a retirement plan that is popular with many small business owners and self employed individuals. The 2015 SEP IRA contribution limit is $53,000 (the 2014 SEP limit is $52,000).
Meanwhile, other studies suggest that another gene, DRD4, may also play a role in traits such as shyness and anxiety. The DRD4 gene codes for a protein that binds dopamine, another chemical messenger that has powerful effects in the brain. Again, the DRD4 gene comes in two forms: a long and a short version.
If a personality trait runs in families, it may indicate that there is a genetic component to the trait because children share 50% of their genes with each parent. Twin studies involve an analysis of any differences between identical twins and fraternal twins.ince identical twins share 100% of the same genes and fraternal twins share only 50% of the same genes, identical twins should be more alike than fraternal twins if a personality trait has a genetic component.