DNA, ethnicity, and phenotype?

[reboun]

Can someone explain me why is DNA-ethnicity relation is stronger than DNA-phenotype relation? My logic still says the opposite.

[Petalpusher]

Genotypes associated with ancestries autosomaly correlate with ancestry, since those were researched to be relevant to ancestry. On the other hand, only some genes are expressed in the visible realm of the phenotype and not necessarily all comform to one set of ancestry, especially in ethnicities that are a mix of sub groups through times.

With that said, we ve never found someone born of Japanese parents that will look like a Papuan or an ethnic European with Congoid skull, because the genes producing those characteristics simply don't exist or rather the individual genotypes that could produce them are in much much lower frequencies (that's how we decipher ancestry through dna to begin with, sets of genotypes frequencies). Most people also confuse some superficial traits to be ethnically associated to some groups.

[reboun]

Genotypes associated with ancestries autosomaly correlate with ancestry, since those were researched to be relevant to ancestry. On the other hand, only some genes are expressed in the visible realm of the phenotype and not necessarily all comform to one set of ancestry, especially in ethnicities that are a mix of sub groups through times.

With that said, we ve never found someone born of Japanese parents that will look like a Papuan or an ethnic European with Congoid skull, because the genes producing those characteristics simply don't exist or rather the individual genotypes that could produce them are in much much lower frequencies (that's how we decipher ancestry through dna to begin with, sets of genotypes frequencies). Most people also confuse some superficial traits to be ethnically associated to some groups.

On GEDmatch results, I saw that Turks of Anatolian descent also have some amount of North European component. I guess it means that Turks of Anatolian descent can also look like North Europeans but with a small probability, right?

[Petalpusher]

On GEDmatch results, I saw that Turks of Anatolian descent also have some amount of North European component. I guess it means that Turks of Anatolian descent can also look like North Europeans but with a small probability, right?

Yes, but the amount will be relatively low, so that it will happen at lower frequencies, and in some physical traits, it needs a rather large numbers of genotypes to be activated in particular way to produce even one trait out of many that we could deem as "northern looking", and that is becoming very unlikely or impossible to happen at some point. It's like trying to win the lottery 3 times, playing only 3 times, instead of out of a million times. Im not talking about Turks especially but in general.

Like for example the difference between 20 and 40% associated ancestry of aparticular group, is not only two times more likely, it's two times each time you "play" on each genotype so you need to win a lot in a row with half the odds, and the probability becomes much higher or lower in the end.