1.0Reference.comhttps://www.reference.comStaff Writerrich600338<blockquote class="wp-embedded-content" data-secret="yz9NjBvLzE"><a href="https://www.reference.com/world-view/ab-negative-rarest-blood-type-c6a2e4e434d87f99">Why Is AB Negative the Rarest Blood Type?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.reference.com/world-view/ab-negative-rarest-blood-type-c6a2e4e434d87f99/embed#?secret=yz9NjBvLzE" width="600" height="338" title="“Why Is AB Negative the Rarest Blood Type?” — Reference.com" data-secret="yz9NjBvLzE" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); </script> https://www.reference.com/wp-content/uploads/sites/2/2023/12/863ea0efc174c5987c4243bf78e59730.jpg1400787AB negative is the least common type of blood due to the genetic factors that affect blood type, according to the American Red Cross. In order for a child to be born with AB negative type blood, one of his parents must have type A and the other parent type B. Less than five percent of the population has either AB, blood, and globally among people of white European ancestry, instances of AB negative blood are .6 percent of the population, owing to the lack of B-type blood found in Europe.