Follow the chromosomes through meiosis

A cell with two pairs of chromosomes is a list. Each chromosome is a tuple of three things: its pair ("1" or "2"), its parent ("m" for the mother or "p" for the father), and the number of chromatids it has. You will write the three steps that change the cell.

The idea. S phase gives each chromosome two chromatids. Anaphase I sends the two members of a pair to different cells. Anaphase II splits the sister chromatids.

Your tasks.

1. Finish replicate. It gives every chromosome two chromatids.
2. Finish anaphase_1. It gives two cells. The dictionary to_first says which parent's chromosome of each pair goes to the first cell.
3. Finish anaphase_2. It gives the two cells made from one cell, each with single chromatid chromosomes.