I am new to jQuery and I want to enable and disable a dropdown list using a checkbox. This is my html: 

<select id="dropdown" style="width:200px">
    <option value="feedback" name="aft_qst">After Quest</option>
    <option value="feedback" name="aft_exm">After Exam</option>
</select>
<input type="checkbox" id="chkdwn2" value="feedback" />

What jQuery code do I need to do this? Also searching for a good jQuery documentation/study material.

jquery drop-down-menu
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