As you can in this graph, there is some overlap between Southern and Northern European. The divergence between Northern European and Southern European is not like the between Caucasoids and Negroids, or those who are mixed between those extremes.
Phenotypes are different to Genotypes though, you could carry recessive gene alleles, that you aren't expressing, that then surface in your offspring as long as your partner is carrying those recessive features too. In Irish families they could have a redheaded child with blue eyes, but the rest of the family has dark eyes/ hair, although red hair isn't recessive in quite the same way blonde hair is. I have blue eyes, and was born with blonde hair (that turned brown), but the rest of my family have dark eyes/ hair, my sister also has a slightly olive complexion. https://www.familyeducation.com/pregnancy/what-color-hair-will-my-baby-have
Here are some examples of Northern European Phenotypes, which make up native "Celtic" populations, that carry dark hair/ eyes. http://humanphenotypes.net/NorthAtlantid.html http://humanphenotypes.net/PaleoAtlantid.html This phenotype however denotes a closer relation to Southern Europeans than the above, but is still found in Northern European populations. http://humanphenotypes.net/Eurafricanid.html
That's a very interesting graph that is missing Germans, Dutch... unless they have a new name I'm not aware of.
This tool is also useful https://g25vahaduo.genetics.ovh/G25modern-scaled-averages.htm For example you can put in English as the target, and the closest relation will be the other British ethnic groups, Irish and the Dutch.
It's missing quite a lot of ethnic groups from the relevant areas, like Polish for example. Germans would be somewhere between English/ French and Lithuanian/ Belarusian/ Ukrainian. Dutch are closely related to Germans and English.
That link and site are more advanced than the casual look a POALer might try. It appears to be for experts.
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