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?
Practise AQA A Level Biology All cells arise from other cells with exam-style questions for A Level Biology. 6 questions covering All cells arise from other cells, matched to the AQA A Level Biology (7402) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
