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2.2 Animal tissues, organs and organ systems

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Question 16

Identical twins P and Q both inherited the same faulty gene associated with an increased risk of cancer.

Scientists compared information about the twins up to the age of 60.

TwinMean time exposed to UV light each week in hoursDeveloped skin cancer by the age of 60
P4No
Q30Yes
a.

Using the information in the table, give one reason why the faulty gene cannot be the only factor affecting whether cancer develops.

[1]
b.

Suggest one biological explanation for the different outcomes of the twins.

[1]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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