HTML

jquery radio button checked on page load

<input type='radio' name='gender' value='Male'>
<input type='radio' name='gender' value='Female'>
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<script>
$(function() {
    var $radios = $('input:radio[name=gender]');
    if($radios.is(':checked') === false) {
        $radios.filter('[value=Male]').prop('checked', true);
    }
});
</script>