Calling mysql procedure using drop down list in PHP - php

Question

I have my drop down form like this:
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST" >
<p>Get a Report of each Gene:<br>
<select name="Prot_Id">
<!--option value="" selected disabled>Select a rating</option-->
<option value="" selected disabled></option>
<option value="chr">chr12:111,843,752-111,889,427</option>
<option value="chr">chr19:17,186,591-17,324,104</option>
<option value="chr">chr2:102,927,962-103,015,21</option>
<option value="chr">chr2:204,732,511-204,738,683</option>
<option value="chr">chr4:123,372,626-123,377,650</option>
<option value="chr">chr4:123,533,783-123,542,212</option>
<option value="chr">chr6:159,456,027-159,466,184</option>
</select>
</p>
<input type="submit" name="submit1" value="Go" />
</form>
I have one MySQL stored procedure Chrome_Seq with one input parameter (eg:chr2:102,927,962-103,015,21 it's the display name for the drop down box).. Now I am writing a PHP page to call this procedure and show the result as table. Here is my PHP code:
<?php
if (isset($_POST['chr'])) {
echo "hi 11";
$id=$_POST['chr'];
echo "<table>";
//connect to database
$connection = mysqli_connect("localhost", "root", "", "KCC_Celiac_Disease");
//run the store proc
echo "hello";
$query= "call Chromo_Seq(".'"'.$id.'")';
$result = mysqli_query($connection, $query) or die("Query fail: " . mysqli_error());
//loop the result set
echo "<tbody>";
// point to the beginning of the array
$check = mysqli_data_seek($result, 0);
$rownew = mysqli_fetch_assoc($result);
foreach($rownew as $k => $v ) {
echo "<th>".$k."</th>";
}
$check = mysqli_data_seek($result, 0);
while ($rownew = mysqli_fetch_assoc($result)) {
echo "<tr>";
foreach($rownew as $k => $v) {
echo "<td>".$v."</td>";
}
echo "</tr>"."<br>";
}
echo "</tbody></table>";
}
?>
Whenever I select a value from dropdown it should run the procedure with that parameter and return the value but I am not getting any result in my output. It's blank.