\documentclass{beamer}

\setbeamertemplate{navigation symbols}{}
\setbeamertemplate{blocks}[rounded][shadow=true]
\setbeamercovered{transparent}

\begin{document}
\begin{frame}{Diapositivas din\'amicas}

  \begin{block}{Gr\'afico secuencial}
    \begin{center}
    \includegraphics<+>[width=.4\textwidth]{../slides/img/fig-1.pdf}
    \includegraphics<+>[width=.4\textwidth]{../slides/img/fig-2.pdf}
    \includegraphics<+->[width=.4\textwidth]{../slides/img/fig-3.pdf}
    \end{center}
  \end{block}
  
  \begin{itemize}[<+->]
    \item Los entornos de listas
    \item salen bien
    \item en modo {\tt handout}
  \end{itemize}

\end{frame}
\end{document}

