What attributes does a chromatid require to be classified as a chromosome?

Given that the average duplication time of E.coli is 20 minutes, how much time will two E.coli cells take to become 32 cells?

Which part of the human body should one use to demonstrate stages in mitosis?

The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?

If a tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single cell undergone?