Describe the role of the following structures or proteins in cell division:

cohesin protein

Describe the phases of the cell cycle and the events that characterize each phase.

The nuclear DNA content of a single sperm cell in Drosophila melanogaster is approximately 0.18 picogram. What would be the expected nuclear DNA content of a primary spermatocyte in Drosophila? What would be the expected nuclear DNA content of a somatic cell (non-sex cell) in the G1 phase? What would be the expected nuclear DNA content of a somatic cell at metaphase?

Contrast the chromatin fiber with the mitotic chromosome. How are the two structures related?

Describe the 'folded-fiber' model of the mitotic chromosome.

You are given a metaphase chromosome preparation (a slide) from an unknown organism that contains 12 chromosomes. Two that are clearly smaller than the rest appear identical in length and centromere placement. Describe all that you can about these chromosomes.