Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA
Structure of nucleic acids and replication of DNA — practice question
The photomicrographs in Fig. 3.1 display stages of the mitotic cell cycle in the root tip of the onion, $Allium\ sp$. They are all shown at identical magnification. Stages A to C are in the correct order, whereas stages K to N are not in the correct order.
(a)[1]
Name stage A and stage C.
(b)[1]
Place stages K to N into the correct sequence, beginning with the stage that comes immediately after stage C.
(c)[3]
Explain how the movement of the chromosomes and spindle during stage L in Fig. 3.1 ensures that the two daughter cells are genetically identical.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A = interphase and C = metaphase (both are needed)” …