JSFiddle - React, Tailwind, and code Playground

HTML

<input type="radio" id="rad_cat" name="animal" /> Cat<br />
<input type="radio" id="rad_dog" name="animal" /> Dog<br />
<input type="radio" id="rad_cow" name="animal" /> Cow<br />
<input type="radio" id="rad_rat" name="animal" /> Rat<br />
<br />
<select id="mysel">
    <option value="none">Choose One</option>
    <option value="rad_cat">Garfield</option>
    <option value="rad_dog">Snoopy</option>
    <option value="rad_cow">Clarabell</option>
    <option value="rad_rat">Ratbert</option>
</select>

JavaScript

$('input[type=radio]').click(function(){
    var anitype = this.id;
    $('#mysel').val(anitype);
});