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.
Rating Newest Oldest. Best Answer: Sex-linked traits are from genes that are on the sex chromosomes (the X or Y chromosomes in humans). This applies to things like color blindness, which comes from a gene on the X chromosome. One's gender can impact whether or how likely one of these traits will be developed.