This code
\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{overprint}
\onslide<1>
Text on slide 1 and 2
\onslide<2>
Text on slide 1 and 2\\
Text on slide 2
\end{overprint}
\end{frame}
\end{document}
creates the output
As the phrase
Text on slide 1 and 2
is used both on slides 1 and 2 I have to repeat it 1 time. Wouldn't it be so much better if I could carry it over from the previous slide and then just append
Text on slide 2
to it.
Is it possible?
\pause
does.Text on slide 1 and 2 \pause Text on slide 1 and 2\\ Text on slide 2