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<p>[QUOTE=&quot;Kasia, post: 3358597, member: 31533&quot;]Actually, you do normally inherit half of each parents dna, except in cases of uniparietal diaomy. But that does not mean that each individual in your past is represented in you. So, yes you can have ancestors dropping out. And as far as detectability goes, an example is Ancestry where they set their minimum to 6 CMs. But that amount is, though detectable, comprised of what has (when matched to others who share that same portion) results which the majority are of IBS rather than IBD... meaning it is shared not because you absolutely have the same ancestor, but your ancestors may have non-unique dna relative to a geographical region... and any matches have to be considered not provable, even if you find a paper trail.&nbsp; Basically, let&#039;s just take one of the great great grands I spoke of..... that person is comprised of, theoretically, 6.25 percent of each of their great great grands, if they inherited an equal amount (and dna is not passed down equally... in fact, some chromosomes actually divide more often than others, and they can divide more based on sex of the person who gets them, and again, any person might be subjected to uniparietal disomy, where part or all of the pair of chromosomes actually comes from only one parent), if it was even, you would only be getting .39%&nbsp; of each of the great great grandparents&#039; great great grands. So you are trying to justify that everyone absolutely inherits a part of each of their 32 ancestors at the great great grandparents level, of which these 32 represent an additional 256 further back ancestors at that second level (though some may be represented more than one time, through endogamy), for a total of up to 510 unique individuals behind you, of whom some may have inherited larger portions of their ancestry or smaller portions or none.</p><p><br /></p><p>It is very plausible that an ancestpr can drop out.... all it takes is that when parents pass on their half, you randomly get more of that parents 3 of 4 Grandparents than is perhaps passed on when your siblings get some.[/QUOTE]</p><p><br /></p>

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