mitosis exam qs

Question 1

Describe and explain the arrangement of the genetic material shown in the above image.

Answer 1

Chromosomes (are) becoming visible because they’re still condensing

Question 2

Describe how a gene is a code for the production of a polypeptide. Do not include
information about transcription or translation in your answer.

Answer 2

(Because) base sequence;
2. (In) triplet(s);
3. (Determines)primary structure (in
polypeptide)

Question 3

The student prepared a temporary mount of the onion tissue on a glass slide. She
covered the tissue with a cover slip. She was then given the following instruction.
“Push down hard on the cover slip, but do not push the cover slip sideways.”
Explain why she was given this instruction.

Answer 3

Push hard – spread tissue;
Not push sideways – breaking chromosomes

Question 4

Describe how you would determine a reliable mitotic index (MI) from tissue observed
with an optical microscope.

Answer 4

Count cells in mitosis in field of view;
2. Divide this by total number of cells in field of
view;
3. Repeat many times