Describe the appearance and behaviour of chromosomes during metaphase and during telophase of mitosis.
State the formula used to calculate the mitotic index of a tissue sample observed under an optical microscope.
A student investigated the effect of exposure to a certain chemical inhibitor on the cell division in onion root tips. The student calculated a correlation coefficient (rrr) between the concentration of the chemical and the mitotic index.
The calculation yielded r=−0.85r = -0.85r=−0.85 with a probability of P<0.01P < 0.01P<0.01.
What can you conclude from this result?