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The Water Cooler
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<blockquote data-quote="Eagle Eye" data-source="post: 2819362" data-attributes="member: 34489"><p>No idea what happened there. </p><p></p><p>What I am saying is that our nuclear DNA (which is found in the nucleus of all our cells) is a mix of our parents DNA. </p><p>Ever wonder why siblings look different from another although they have the same parents? Thats due to genetic recombination, which is basically 1. Independent assortment and 2. crossing over. Both processes happen during gamete formation (the making of sperm and eggs). because of this, no two eggs made by one woman are the same, and no two sperm made by one man are the same genetically. Actually it is just extremely unlikely that they are the same. Therefore when we consider two fertilization events (older brother and younger brother), the result is offspring with different combinations of the parental genes. Therefore, one sibling may get more of Dad's paternal side, and another get more of dad's maternal side. Same for moms DNA. </p><p></p><p>SO, when we look at Nuclear DNA we don't know exactly which lineage we are getting (tracing). The only given is it will include both dad's and mom's.</p><p></p><p>But, Mitochondrial DNA (found in the mitochondria) is inherited maternally only. So the linage become much easier to trace. But it is very restricted aka tracing back our mother's mother's mother's mother etc etc. </p><p>IMHO not really a good representation of ones ancestry.</p></blockquote><p></p>
[QUOTE="Eagle Eye, post: 2819362, member: 34489"] No idea what happened there. What I am saying is that our nuclear DNA (which is found in the nucleus of all our cells) is a mix of our parents DNA. Ever wonder why siblings look different from another although they have the same parents? Thats due to genetic recombination, which is basically 1. Independent assortment and 2. crossing over. Both processes happen during gamete formation (the making of sperm and eggs). because of this, no two eggs made by one woman are the same, and no two sperm made by one man are the same genetically. Actually it is just extremely unlikely that they are the same. Therefore when we consider two fertilization events (older brother and younger brother), the result is offspring with different combinations of the parental genes. Therefore, one sibling may get more of Dad's paternal side, and another get more of dad's maternal side. Same for moms DNA. SO, when we look at Nuclear DNA we don't know exactly which lineage we are getting (tracing). The only given is it will include both dad's and mom's. But, Mitochondrial DNA (found in the mitochondria) is inherited maternally only. So the linage become much easier to trace. But it is very restricted aka tracing back our mother's mother's mother's mother etc etc. IMHO not really a good representation of ones ancestry. [/QUOTE]
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