Does "crossing over" influence ethnicity estimate?

[Rafael Passoni]

For instance, my greatgrangpa was a half French/half Syrian man and half of his chromosomes are 100% French. But his daughter has inheired mixed chromossomes and so on until reach me and my mom. Could it be a reason because my Syrian DNA was hidden and it blinds algoritms?




My Gedmatch kit number: ZJ8460304 (ES+IT+SY+FR)
My mom Gedmatch kit number: JP6645888 (FR+IT+SY)

[lei.talk]

while one might expect to see 1/16 of your gene-set
consisting of distinctly syrian material,
are there - in fact - uniquely syrian genes?

secondly,
the mixing of genes (https://en.wikipedia.org/wiki/Meiosis#Comparison_to_mitosis) is a chemical process
affected by many variables

and does not have mathematical results.

[Petalpusher]

Segments belonging to a particular heritage will get recombined with time as they get broken down in tinier ones each generations.

Also keep in mind that most of the dna you get is West Eurasian so a lot of it is the basic same type of dna. Even middle eastern does not peak out that far from Europe in direction to Africa. Syrian is probably somewhere in the first and closest dark red cluster here.


https://i.postimg.cc/FsXFTQ9w/wpc1.jpg



Where is your French from btw?