DNA fingerprinting is commonly used to compare DNA samples taken from the crime scene with those taken from suspects, to either prove or disprove their innocence. In the UK, 10 markers are analysed to produce DNA profiles from the samples taken in criminal investigations. These are then compared to (and stored in) the National DNA Database (NDNAD) to identify if there’s a match. This database currently contains DNA profiles for 10% of the UK population, along with the individuals’ names and ethnicities. Anyone who’s been arrested for a recordable offence has their information recorded on the database, unless they are found innocent or not charged – in these cases, the individuals’ biological samples and corresponding information is destroyed within six months of sample collection.
The components of the STR profile are represented as data consisting of a series of peaks. For each location (locus) along the DNA molecule there will usually be two peaks, one from each parent, representing STR components (alleles) with differing numbers of repeats. If an allele with the same number of repeats is inherited from both parents, only one peak will be present.
There are a number of reasons why the vast majority of living humans are a blend of ethnicities. Firstly, from around 1850 onwards, people started to migrate around the world and mix in large numbers. Secondly, as national borders have changed over time, the only clear cut ethnic groups are those that are highly isolated. For example, as individuals have migrated in large numbers between France and Britain in the last few thousand years; those in Northern France exhibit a similar ethnic mix to those in Southern England.
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.
We have zeroed in on autosomal tests only. These tests are used to give you the ancestry percentages and cousin matching most people are seeking. If you are interested in YDNA (paternal line only, for men) or mtDNA (maternal line only) you can find these tests at Family Tree DNA. 23andMe also offers limited motherline and fatherline results as part of this main ancestry test.
Four testers took 23andMe DNA kits during testing. We received our results 32 days later, and testers were highly satisfied with the overall experience, from ease of sample collection to the thoroughness of the results. Recently, the company updated its database and increased the number of geographic regions from around 170 to more than 1,000. The updated ancestry reports are also more detailed, especially for non-European regions. 23andMe’s ancestry tests give you information split into several different reports spanning your ancestry composition, maternal and paternal haplogroups, neanderthal ancestry and DNA family. Testers particularly liked the timeline feature, which estimates when your most recent ancestor lived in each of your matched regions. 

There are a number of reasons why the vast majority of living humans are a blend of ethnicities. Firstly, from around 1850 onwards, people started to migrate around the world and mix in large numbers. Secondly, as national borders have changed over time, the only clear cut ethnic groups are those that are highly isolated. For example, as individuals have migrated in large numbers between France and Britain in the last few thousand years; those in Northern France exhibit a similar ethnic mix to those in Southern England.

23andMe started out by testing for genetic markers of diseases and medical conditions before rolling that back in response to the governmental concerns. It has since started slowly adding more health-related features with approval from the FDA. In April, 23andMe got approval to offer risk analysis for ten genetically linked diseases. The company now offers two options: Health + Ancestry ($199) and Ancestry ($99). The Health + Ancestry plan includes testing for genetic health risks and carrier status, as well as reports on your genetic weight, hair loss, and other traits.
We each had two ancestors one generation ago, four ancestors two generations ago, and by the time we’ve gone back five generations, 32 ancestors have each contributed approximately 3% of our autosomal DNA! As an ethnicity test can’t show you how your autosomal segments have been passed from one generation to the next, trying to derive meaningful information about the ethnicities of your ancestors more than five generations ago is virtually impossible.
Like many of the best DNA test kits, Living DNA examines autosomal and mitochondrial DNA, as well as Y-DNA for males. The service’s Family Networks feature, currently in beta, allows customers to find DNA relatives within its database. I received test results 27 days after dropping my sample in the mail. One fun Living DNA feature is that you can order your DNA analysis in coffee table book form.
The 100,000 Genomes Project is an NHS initiative, run by Genomics England, and is the largest national genome sequencing project in the world. On entering, patients have their entire genome, of more than 3bn base pairs, sequenced. This is different from commercially available genetic testing kits, such as those from 23andMe, which only look at very small stretches of DNA in a process called genotyping. The hope of the NHS is that having so much genetic information, from so many different people, will allow “groundbreaking discoveries about how diseases work, who could be susceptible to them, how we can treat them, and what treatments might work”.
Ancestry offers cousin matches for free as part of your DNA purchase but charges an additional monthly fee for access to its trees and some additional features. They recently added Genetic Communities and have numerous other features to help you connect via your tree to genetic matches. This makes research very easy for those who are already using Ancestry and are holding a paid subscription.

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.
My favorite DNA test for finding ethnicity is Ancestry DNA.  My second favorite is 23 and Me.  The way Ancestry presents their DNA results is easy to understand, and their test is general less expensive than 23 and Me.  I have also found Ancestry DNA’s ethnicity estimates very closely represent what I have been able to research the old-fashioned way, both in my family and that of my husband and other family members.
Alternatively, if you believe your "Italy/Greece" result indicated your known Italian heritage, it is possible that your son simply did not inherit the associated DNA from you. We all inherit roughly half our DNA from each parent, but the DNA we inherit is selected at random, and so even full siblings can have different ancestry results, depending on which genetic variants they inherited.
These tests can reveal the migratory paths of your paternal and maternal ancestors after they left Africa 200,000 years ago. By studying the migratory route they took, this can help you identify the ethnic groups they may have been part of. That said, as your paternal line is your father’s father’s father etc., and as your maternal line is your mother’s mother’s mother etc.; your paternal and maternal ancestors represent a smaller and smaller proportion of your ancestry the further back you go (just one sixteenth of your total ancestry five generations ago). Therefore, tracing your migratory paths back thousands of years may provide insights, but they’re a poor means of exploring your ethnic mix.
Otherwise, the home-testing kits could be said to fit in with our increasingly health-conscious and, if you wish to be cynical, narcissistic times. What says you’re “special” more than finding out everything about yourself, right down to the nitty-gritty of genetics? In this way, these kits could be viewed as the latest plaything of the “worried well”. You could see how the scientific approach would appeal to the health-obsessed of all sexes and ages, your marathon runners and serious gym-goers, who take their fitness extremely seriously.
Most of this trait data tells you things you already know, like your hair and eye color, but it is fun to see them compared to your genetic relatives and the world at large. We also found it fascinating to learn more about how these physical traits are genetically determined. For example, finger length ratio is determined by hormonal exposure in the womb, with higher testosterone exposure resulting in a better chance of having a longer ring finger. 23andMe’s Health report for finger length ratio looks at 15 gene markers to estimate your likelihood of having longer ring fingers or index fingers.
The situation is made even more complex if it is considered that three or more people may have contributed to a particular DNA result. Often, in such cases, it is not possible for a scientist to undertake a reliable statistical evaluation of the mixed DNA result. If the DNA result indicates that a very low level of DNA has been detected, it is recommended that the reporting forensic scientist consider the possibility that the result may have been derived from a very low level of DNA from more than one person, some of the components of which may be missing from the DNA result because of the low level of DNA present
There are mixed reactions to the use of ancestry DNA databases in criminal cases. On one hand, the rise of readily-available DNA information for millions of people has led to the arrests of several suspects related to long-cold cases, including the arrest of the Golden State Killer. On the other hand, law enforcement accessing private databases of genetic information from consumers raises several questions regarding privacy and ethical issues.
Think of all the words you can spell. I bet there are loads. But each word is made using the same selection of letters. Yes, sometimes we leave letters out, sometimes we repeat letters, but we always have the same selection of letters. Depending on how we arrange the letters of the alphabet we can make new words. The same is true in the four letter alphabet of DNA.