Gross domestic product expanded 2.2 percent in the fourth quarter, revised down from 2.6 percent estimated last month, the Commerce Department said on Friday. “It was basically as expected, but it certainly shows weak growth in the quarter.” said Tim Ghriskey, chief investment officer of Solaris Group in Bedford Hills, New York. Each of the three major indexes were on track for a fourth straight week of gains, although the weekly climb has been slight, with the Dow and S&P 500 near record highs and the Nasdaq within striking distance of the 5,000 level.