JSFiddle - React, Tailwind, and code Playground

HTML

<select id='combo'>
<option value="-">Sexo...</option>
<option value="M">Macho</option>
<option value="H">Hembra</option>
</select>

JavaScript

$(document).ready(function()
{
  var opciones = "";
  $('#combo option').each(function(){
    opciones+=$(this)[0].outerHTML;
  });
  alert(opciones);
});