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Cell division, cell diversity and cellular organisation

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Question 8

During cell division, the quantity of genetic material in human cells changes as the cell goes through different phases.

Consider the following sequences describing the DNA content (relative to the haploid chromosome number, nnn) before, during, and after different types of cell division:

  • Sequence W: n→2n→nn \to 2n \to nn→2n→n
  • Sequence X: 2n→4n→2n2n \to 4n \to 2n2n→4n→2n
  • Sequence Y: 2n→4n→2n→n2n \to 4n \to 2n \to n2n→4n→2n→n
  • Sequence Z: 4n→2n→n 4n \to 2n \to n\,4n→2n→n

Which row in the table below correctly identifies the sequences for mitosis and meiosis in human cells?

MitosisMeiosis
ASequence XSequence W
BSequence YSequence X
CSequence XSequence Y
DSequence ZSequence Y
A

Mitosis: Sequence X; Meiosis: Sequence W

B

Mitosis: Sequence Y; Meiosis: Sequence X

C

Mitosis: Sequence X; Meiosis: Sequence Y

D

Mitosis: Sequence Z; Meiosis: Sequence Y

Markscheme

Cell division, cell diversity and cellular organisation Questions

  1. A Level
  2. /Biology
  3. /Cell division, cell diversity and cellular organisation

40 exam-style questions on OCR A A Level Biology Cell division, cell diversity and cellular organisation. Each one has a worked solution and a mark scheme showing where the marks go.

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