Same genetic root does not mean what you seem to think it does.
Semitic is a group of languages. The languages are similar, but not the same.
If it was a matter of being "Semitic" then all Arameic, Samaritians, etc would be also of the same genetic root as the Arabs.
So would the Copts, the Syrians, the Kurds.
All must have had intermarriages with the Arabs at some point, no matter what the number is.
DNA, the genetic roots, is about where the people come from, that is what a DNA test proves.
Can any Arab take the test and prove that they have Jewish DNA, aka, some ancestor came from the ancient land of Canaan/Israel?
That is what many are proving, from China, India, Ethiopia, etc.
When are the Arabs going to do allow Israel to conduct DNA tests on those who claim to have Jewish Ancestry?
Still, it does not mean that ALL Arabs, as they come from Arabia, have Jewish ancestry, common genetic roots, in them.
As you can tell, it is not that Arabs ARE genetically connected to Jews, is that they have been lying for the past 50 years that they have any ancestral connection at all.
Root means, Jews and Arabs come from the same place.
They do not, and Arabs know that.
Another attempt to displace the Jews from their ancient Land and turning Ancient Israel into a majority, or only, Arab population with an unproven test is nothing to get upset about.
The Jews have the part of Israel they have and they are keeping it, and keeping the country and the population safe, despite all the attempts to the contrary.
No different than it was during Greek or Roman control of their land.
No Arabs in sight.