Do the Math – How Many Ancestors Do I Have?

Sometimes you just need a simple answer to the question:   How many ancestors do I have?   There's a mathematical formula for figuring out how many ancestors you have at each generation. x=2n  

x is the number of direct-line, biological ancestors you have;

n is the generation back from you.

So, one generation back, x=2¹ or x=2, you have 2 ancestors, your biological parents. You may also have adopted parents, step-parents,  etc, but for the purpose of DNA matches, we're concerned with biological ancestors you may have inherited DNA from. As a general rule, this formula shows the largest number of ancestors you could have.

At some point, you'll have pedigree collapse and this formula no longer applies, but it works well for the limited number of generations we examine in most of our family history work.

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Happy DNA Day – an Offer for AncestryDNA Testers

Happy DNA Day!   23andMe is holding a one-day special for AncestryDNA customers. If you've tested anywhere other than Ancestry, skip to the end for sites where you can get free offers. Today only, Ancestry DNA testers can upload their test results to 23andMe (for free) and receive 4 free health reports! 23andMe doesn't usually accept DNA test uploads.         To download your AncestryDNA, you'll need to:   Login to your account at Ancestry.com Navigate to the DNA tab on the top menu bar Select "Your DNA Results Summary"         Select the Gear icon next to "Settings" on the right side of the page         PAY ATTENTION HERE - Select "Download Raw DNA Data" on the right side of the window BE CAREFUL, it's inconveniently close to a "Delete Test Results" button         Enter your Ancestry Account passw…
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DNA Day Sales and some DNA Test Comparisons

DNA Day is one week away!   April 25th is DNA Day and companies usually offer sales on DNA test kits.   UPDATED: As of April 20th, all these sites are offering sales on their DNA tests (listed in order of sale announcement): MyHeritageDNA LivingDNA 23andMe Ancestry.com FamilyTreeDNA     Here are my very biased DNA test comparisons with what I like and dislike about each test. Visit the ISOGG Wiki for less biased information.         MyHeritageDNA   Autosomal Test Sale price: $69 + shipping (at their site) Sale price: $68 at Amazon.com and free shipping with Amazon prime List price: $99 My Bias: My husband currently works for them. I prefer cheek swab tests to saliva tests. I have a free tree & records at their site because I'm LDS. They have a great business relationship with FTDNA, whom I respect a ton. I know what their upcoming products offer (see last pa…
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