JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
<div class="wrapper">
  <table id="table_cultures">
    <tr>
      <td>Just a string</td>
      <td>Dropdown</td>
      <td>
        <div class='foo'> something..</div>
      </td>
    </tr>
  </table>
  <button id="plus_button" onclick="addRow()">+</button>
</div>

JavaScript

$(".wrapper").on("click", "#plus_button", function(event) {
  $("#table_cultures td:last").clone().appendTo("#table_cultures tr");
});