Are the 144,000 actually 144,000 physical Jews because genetically speaking, this seems like an impossibility seeing that there would need to be 12,000 from each tribe, I am just struggling with Spiritual/physical Jews, because there is obvious importance in understanding the distinctions[/QUOTE]
After the rapture of the Church beginning around Rev 4, at Rev 7 an angel will find 12,000 undefiled Jews (called virgins, which can be among men and women concerning purity of body and heart) of each tribe of Israel across the world. Dan is left out, Levi put in Dan's place, without explanation! He will mark their foreheads with the name of the Father God on them, protecting them from the Beast. John saw and heard them sing later in Rev. 14, still in Heaven.
In Rev 7, after the 144,000 are marked and translated to Heaven like Elijah was taken alive, a great sea of martyrs that die will be the first rapture after the tribulation begins.