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2.1 Supplying the cell

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Question 5

A species of fish has 48 chromosomes in each body cell.

Researchers grow fish fin cells with and without chemical X. Chemical X prevents DNA replication but does not prevent a cell from entering mitosis.

After mitosis, the researchers count the total number of chromosomes across the two new nuclei.

TreatmentTotal number of chromosomes across the two new nuclei
Without chemical X96
With chemical X48

Use the data and your knowledge of mitosis to explain why cells treated with chemical X cannot produce two genetically identical daughter cells, each with a full set of chromosomes.

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Markscheme

2.1 Supplying the cell Questions

  1. GCSE
  2. /Biology
  3. /2.1 Supplying the cell

194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.

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