DNA tests offer a wealth of insights into your connections to family, history and geographical locations. They both entertain and encourage you to dig into what you know about yourself. The tests make great gifts to bring you closer to your family and involve you and your family in the development of a cutting-edge science at the same time. Beyond that, the information is extremely useful for adoptees, people looking for lost relatives, genealogists and for medical science. 
As stated at the start of this guide, each one of the main tests will provide you with easy-to-use reports and cousin matching that you can use in your genealogy research. You will need to carefully review the information provided in this guide to make a decision about which test is best for your particular needs. You may also choose to test with (or upload your results to) multiple companies.
Below we have included both a quick comparison chart that looks at each DNA testing option side by side and a detailed breakdown of each section in that chart. We’ve covered Family Tree DNA, MyHeritage DNA, AncestryDNA and 23andMe in our comparison because these four companies are the main trusted providers of genetic genealogy tests in the current market.
Although, I have absolutely no British or Irish ancestry, I found my results extremely satisfying. I particularly appreciate that living DNA gives you a lot of ways to view your data. You can see your ancestry results as color-coded dots filling up a person’s silhouette, on a map, as a pie chart or on a timeline. All the graphics present the same set of data, but each has its own appeal. Within each graphic, you can also choose to view global or regional matches and cautious, standard or complete estimates, which each have a different level of detail and certainty.
When asked about how database size affects ancestry results, David Nicholson, co-founder of Living DNA, told us, “The tests absolutely rely on the reference database. If you have Polish ancestry but there are no people in the database who are Polish, then what the test will do is show what the next closest group is next to Polish, like German or Eastern European ancestry.” 
Although reference populations are the primary method by which companies calculate your ethnic mix, they don’t represent actual living populations. Instead, they’re a theoretical group who share a unique set of genetic variants, believed to belong to a distinct ethnic group in the past. This is why an ethnicity DNA test will show you that you’re a mix of different ethnicities, instead of placing you in a single ethnic group.
AncestryDNA is a cutting edge DNA testing service that utilises some of the latest autosomal testing technology to revolutionise the way you discover your family history. This service combines advanced DNA science with the world’s largest online family history resource to predict your genetic ethnicity and help you find new family connections. It maps ethnicity going back multiple generations and provides insight into such possibilities as: what region of Europe are my ancestors from, or am I likely to have East Asian heritage? AncestryDNA can also help identify relationships with unknown relatives through a dynamic list of DNA matches.
Another key customer type could be people like myself, hurtling through middle age, perhaps just starting to feel the cold bony hand of mortality clamp down on their shoulder. People, who, in the past, may not have exactly prioritised their health, who are starting to wonder what may be in store for them and who are in the (“Hypochondriacs R Us”) market for some hard-core insight and advice.

Our Ancestry Service helps you understand who you are, where your DNA comes from and your family story. We analyse, compile and distill your DNA information into reports on your Ancestry Composition, Ancestry Detail Reports, Maternal & Paternal Haplogroups, Neanderthal Ancestry, Your DNA Family and provide a DNA Relatives tool to enable you to connect with relatives who share similar DNA.
Early and active treatment of FH can substantially reduce the risk for heart disease. FH treatment focuses on lowering LDL cholesterol levels, and FH is usually treated with cholesterol-lowering medications. Lifestyle modifications, including diet, exercise, and weight control can help lower LDL cholesterol levels. But these changes are generally not enough to effectively manage the condition. In extreme cases of FH, LDL-apheresis, a procedure that filters cholesterol out of the blood, can be used when other treatments have failed.

While 23andMe does offer DNA relative matching and some tools to compare your genes to your DNA relatives, it doesn’t have robust genealogy tools, as its focus rests more in personal discovery and exploration. To that end, 23andMe has an optional health upgrade that provides reports on DNA traits like hair color and genetic predispositions to certain illnesses and diseases. It is the only DNA test with FDA approval for testing genes linked to conditions such as Type 2 diabetes, certain types of cancer, late-onset Alzheimer’s disease and Parkinson’s disease. If you’re interested in the health portion of the test, we recommend buying the Health + Ancestry test together, as this option costs less than upgrading later.
Good explanation, but I was a little distressed by the part of the analogy that says people know what work to do because "someone tells us." That statement makes people sound like robots and that we do not make decisions on our own. Maybe this is lost on me because I work for myself, but this paints the picture of a chain of people telling other people what to do and everyone following blindly. Something to think about when discussing this concept with children! Humans have free will... :)

The DNA holds or stores the information using code in various forms, configurations, instructing cells what to do. Yes the DNA sends out instructions, ( or "tells" other celss what to do etc.. like a computer program can tell a robot what to do or carry out multiple functions. My question still remaining is... information came from an intelligent mind... not the physical data that it holds like DNA holds the information, it can copy the information.. but DNA did not code itself...it received the instructions.. no matter how long ago from a mind or an intelligent designer. Does ANYONE on this site agree? I have not seen anyone else question this.

It should be said that if these Family Finder tools sound like a good way to add to your family tree, the majority of the matches you’ll be shown will be 3rd cousins or more distant, and it can take a significant amount of research to place them on your tree. That said, if you’re prepared to contact your matches and try to piece together your familial connection, using the Family Finder feature can be lots of fun and a great way to make friends all over the world!
G6PD deficiency is a common genetic condition caused by defects in an enzyme called glucose-6-phosphate dehydrogenase, or G6PD. The G6PD enzyme helps protect red blood cells from damage. In people with G6PD deficiency, red blood cells are destroyed upon exposure to certain environmental triggers, which can lead to episodes of anemia. This test includes the most common variant linked to G6PD deficiency in people of African descent.
MyHeritage shows cousin matches as part of your DNA purchase for free and has some really wonderful tools to connect your research to your DNA matches. Using smart matching features to see how your tree is connected to others, and adding records you discover this way, may cost an additional monthly fee however. Still, MyHeritage is generally less expensive than Ancestry. You can also try their record collections for free here.
By comparing the arrangement and distribution of the peaks, it is possible to compare profiles of known origin with a profile from a crime sample. If the two profiles match, databases are used to estimate the probability of obtaining a matching profile from a person selected at random; this is referred to as thematchprobability. Closely related individuals are more likely to share DNA profiles than more distantly related individuals.
A relative of mine recently had a DNA test done. When he got the results, the ethnic groups which he was told he was a part of were just didn't add up. The family name on my grandmothers side in Germany is so rare only a few families exist with the family name. Is it possible since this DNA has never been used as a genetic marker in the passed that it could be misidentified. Basically being told your Scandinavian when you know you are German??
More controversially, some of these kits profess to tell you your biological (as opposed to actual age) by measuring the length of your telomeres (in basic terms, the caps at the end of each strand of DNA that protect chromosomes, like plastic tips at the end of shoelaces). Other tests, such as 23andMe, predict higher risks of developing serious conditions, such as multiple sclerosis, Alzheimer’s and Parkinson’s, including the test for BRCA1/BRCA2 (breast and ovarian cancer) that Angelina Jolie famously underwent, going on to have a preventative double mastectomy and surgery to remove her ovaries.
A friend of mine knew I had been working on my family history and bought me an AncestryDNA kit for my birthday. My results were surprising to say the least. I discovered I’m 35% Native American, 5% African and 29% from the Iberian Peninsula. This has drastically broadened the way I think about my identity and heritage. I feel connected to those parts of the world now and I’m excited to see how far back our records can go.

Familial hypercholesterolemia (FH) is a genetic condition associated with very high levels of cholesterol in the blood, specifically low-density lipoprotein (LDL), or "bad" cholesterol. High cholesterol due to FH increases the risk for early cardiovascular disease, which can lead to a heart attack. This test includes 24 genetic variants linked to FH.
There is one really, really important thing to know about this estimate, however.  Each child inherits 50% of their DNA from each parent.  That means that 50% of their parents’ DNA does NOT get passed down to the child.  This can mean that a child of a 100% Eastern European person will only show 50% Eastern European DNA, and their grandchild will only show 25%, and their great-grandchild 12.5% – in a perfect scenario.
We provide expert advice and support in all aspects of DNA testing: paternity, maternity, siblingship, ancestry, DNA storage, and forensic consultancy. DDC has a large legal services client base and provides a comprehensive range of services which includes arrangement of sample collection, chain of custody, quality assurance, and assistance in the interpretation of results, backed by a dedicated customer support team and overseen by the company’s full time geneticist.
A relative of mine recently had a DNA test done. When he got the results, the ethnic groups which he was told he was a part of were just didn't add up. The family name on my grandmothers side in Germany is so rare only a few families exist with the family name. Is it possible since this DNA has never been used as a genetic marker in the passed that it could be misidentified. Basically being told your Scandinavian when you know you are German??
DNA profiling isn’t exclusive to human DNA. Animals also have genetic markers in their DNA which can be used to build up a profile for DNA identification or determining parentage. The most common animals that this is used for are dogs. Similarly to human DNA profiling, dog DNA profiling uses 10-20 markers in order to build up a profile that can be used to identify your dog if it is ever lost or there is some kind of ownership dispute. Companies that offer this service will often include the profile in the form of a certificate, with details about your dog along with its DNA profile. It should also be said that these companies tend to store your dog’s profile in their database, so you that you can check back with them if you ever need to.

The results of mixed DNA profiles may therefore provide reduced match probabilities when compared with non-mixed profiles. It may be possible for a scientist to be able to assess the relative amount of DNA contributed by different donors in a DNA mixture. If one person has contributed a clear and distinct majority of the DNA detected, that part of the profile may be referred to as the “Major Contribution”.
What we would expect to find then in this example is that the two descendants of John show a very close match, and the two descendants of James also show a very close match (because we know from conventional paper based research that they are related). If all four match very closely, then that’s further evidence to add to our theory that John and James were really brothers. Not conclusive proof- but pretty solid evidence.