forms - radiobutton, dropbox

Radiobutton

<form>
  <input type="radio" name="gender" value="male" checked> ανδρας<br>
  <input type="radio" name="gender" value="female"> γυναικα<br>

</form>

 dropbox

<select name="cars">
  <option value="citroen" selected>Citroen</option>
  <option value="saab">Saab</option>
  <option value="fiat">Fiat</option>
  <option value="audi">Audi</option>
</select>

 php
<?php if ( $gender=="female") echo "checked";
       if ( $gender=="male") echo "checked";


?>