In the WordPress back-end you have to use checked="checked" (stricter XHTML), because the CSS will not be applied otherwise:
<input type="radio" name="colors" id="blue" checked="checked">
this is the CSS that applies the blue dot:
WordPress already provides a function for this checked()
<input type="radio" name="colors" id="blue" <?php checked( 'red', get_option( 'color' ) ); ?> />
so you dont have to do an If and echo.
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