How did Allah curse and transform all the Jews, despite there being a repentant group and a group that did not sin, and does the curse transfer from ancestors to descendants?

The claim that Jews are the chosen people of God is false. God cursed many generations of them because of their disbelief and disobedience, not because of the actions of their ancestors. As for their preference mentioned in the Quran, it was over the people of their time, for those among them who believed. The story of the People of the Sabbath illustrates that God transformed the unjust transgressors, and saved those who enjoined good and those who remained silent but detested the evil, which confirms that the curse and punishment befall those who disbelieve and disobey, and not everyone.