Chromosomes by their centromere

Each chromosome below is given by the lengths of its short arm and its long arm, in micrometres. You will name each one from where its centromere lies, count how many there are of each kind, and list the telocentric ones.

The idea. Work out the short arm's share of the whole length. Use these rough cut-offs: a share of 0 is telocentric, below 0.2 acrocentric, below 0.4 sub-metacentric, and the rest metacentric.

Your tasks.

1. Complete kind(short, long) so that it returns the name.
2. Fill the dictionary counts with each name and how many chromosomes have it.
3. Set telocentric to a list of the chromosomes with no short arm.