<tbody id="myTable">
                <?php
                mysqli_set_charset($conexion, "utf8");
                //Generamos consulta.
                $sql = "SELECT  concat(a.nombre, ' ', a.Apellido), Seccion, r.IdRegistro
                        From registro r
                        INNER JOIN alumno a  on r.Identidad_Alumno = a.Identidad
                        where  IdGrado = '$grado' and IdModalidad = '$modalidad' and Seccion ='$seccion' and Anio = '$anio'";
                $result = mysqli_query($conexion, $sql);
                while ($ver = mysqli_fetch_row($result)) {
                    $datos =  $ver[0] . "||" .
                        $ver[1];
                    ?>
                <tr>
                    <td> <?php echo $ver[0] ?> </td>
                    <td hidden><?php echo $ver[2] ?></td>

                    <td>
                        <button type="button" class="btn btn-success" onclick="asiste()" id="si">SI</button>
                        <button type="button" class="btn btn-danger" onclick="inasiste()" id="no">NO</button>
                    </td>
                    <td id="des">Realizar Asistencia</td>
                </tr>
                <?php
                }
                ?>
            </tbody>