Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA

Structure of nucleic acids and replication of DNA — practice question

Fig. 1.1 depicts a cell from a female fruit fly, Drosophila melanogaster, at one stage of mitosis.

(a(i))[1]

Name the mitotic stage illustrated in Fig. 1.1.

(a(ii))[1]

Shade one homologous pair of chromosomes.

(a(iii))[2]

Name the structure labelled W and describe what it does.

(b)[3]

State what happens to structure X and to structure Y from the stage shown in Fig. 1.1 up to the end of cell division.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Prophase.” …