For questions 1–4, match each stage of the cell cycle to its correct description.
Key:
$\begin{array}{ll}{\text { a. } G_{1} \text { stage }} & {\text { b. S stage }} \\ {\text { c. } G_{2} \text { stage }} & {\text { d. } M(\text { mitotic }) \text { stage }}\end{array}$
At the end of this stage, each chromosome consists of two attached chromatids.
