PHOENIX - While the 2011 Arizona law is unique in the nation, this isn't the only bid by legislators across the country to impose gender restrictions on abortion.

Elizabeth Nash, of the Guttmacher Institute, said Oklahoma and Pennsylvania both have laws making it illegal to perform an abortion based on the gender of the fetus. Nash said a similar law was approved in Illinois but has been struck down by the court.

Two other states adopted laws this year that are waiting to go into effect.

Kansas legislators approved a ban on abortion for gender selection, Nash said. And she said a North Dakota law approved makes it illegal to abort a fetus based not only on gender but also on genetic defects such as Down syndrome.

U.S. Rep. Trent Franks, R-Ariz., has introduced federal legislation similar to what was approved in Arizona. He removed the race-based provision from his measure before a vote last year but still fell short of the two-thirds vote needed for a fast-track procedure allowed in the House. State Rep. Steve Montenegro, R-Litchfield Park, who sponsored the 2011 law now being challenged in federal court, works in Franks' Arizona office.