Related על מגילה 4:6

On Yom Tov five [read from the Torah], on Yom Kippur six, and on Shabbat seven. If they wanted to add, they may not add, the words of Rabbi Yishmael. Rabbi Akiva says, on Yom Tov five, on Yom Kippur six, and on Shabbat seven, and if they wanted to add, they may add. Everyone counts toward the quorum of seven [readers], even a woman, even a minor. [However,] we do not bring up a woman to read in public.

One who leads the responsive recitation of the Shema, or blesses over fruit or over matzah, behold, he should not answer "amen" after himself. If he answered ["amen" after his own prayer], behold, this is how ignoramuses act. We do not answer with either an "orphaned amen" (i.e., where one does not know to what blessing he is saying "amen"), or a "truncated [amen]" (i.e., where one does not pronounce the entire word). Ben Azzai says, one who answers with an "orphaned amen" -- his children will be orphaned; with a "truncated [amen]," his days will be truncated. But whoever prolongs [his amen], his days and years will be prolonged.