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Message: <blockquote data-quote="Yorksman" data-source="post: 395733" data-attributes="member: 55568">Genes survive and propagate because they offer some advantage which tips the balance in favour of survival in certain situations. So for example, sickle cell anaemia, normally seen in modern western populations as a debilitating genetic condition is widespread in sub sahran africa because the sickle cells offer some protection against malaria. Factor five leiden mutation, a genetic blood clotting disorder which increases the risk of a number of thrombotic conditions was quite useful in pre history as it helped heal wounds and helped women stem excessive bloodloss during childbirth. My own Y chromosome line, haplogroup I comes with a 50% increase in coronary artery disease but the numbers of descendants of the one individual who founded this line about 20,000 years ago are found in many parts of europe. So, we haven't done too badly.<img src="http://upload.wikimedia.org/wikipedia/commons/4/42/Haplogroup_I_%28Y-DNA%29.PNG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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