Ephraim was, according to the Book of Genesis, the second son of Joseph and Asenath. Asenath was an Egyptian woman whom Pharaoh gave to Joseph as wife, and the daughter of Potipherah, a priest of On.
Abraham 1 wrote:26 Pharaoh, being a righteous man, established his kingdom and judged his people wisely and justly all his days, seeking earnestly to imitate that order established by the fathers in the first generations, in the days of the first patriarchal reign, even in the reign of Adam, and also of Noah, his father, who blessed him with the blessings of the earth, and with the blessings of wisdom, but cursed him as pertaining to the Priesthood.
27 Now, Pharaoh being of that lineage by which he could not have the right of Priesthood, notwithstanding the Pharaohs would fain claim it from Noah, through Ham, therefore my father was led away by their idolatry;
Has there been any attempt, either within the hallowed halls of mopologia or the Church itself, to address this issue?
Before anyone wants to quibble about whether all Egyptians were cursed,
Abraham 1 wrote: 21 Now this king of Egypt was a descendant from the aloins of Ham, and was a partaker of the blood of the Canaanites by birth.
22 From this descent sprang all the Egyptians, and thus the blood of the Canaanites was preserved in the land.
This invalidates the authority of the church as the restored church of God. That is, if we really take the idea of authority seriously. Which the church always has. In fact, without the idea of authority, there is really no Mormonism.
I suppose if the church just admitted that the priesthood ban was a mistake AND that the Book of Abraham is not true, all this goes away. But if it wasn't a mistake, and the Book of Abraham is true, then the church is without authority.
Remember that Joseph Smith himself was a pure decedent of the Biblical Joseph, father of Ephraim and Manasseh, per 2 Nephi 3.
http://www.LDS.org/scriptures/Book of Mormon/2-ne/3.6?lang=eng#5