O-LevelBiologyGenetics & Variation5090/12 · Oct/Nov 2019 · Q371 Mark

A student wrote some statements about chromosomes, but made a number of mistakes. 1 There are 46 pairs of chromosomes in a human body cell. 2 In gametes, chromosomes are found in pairs. 3 Males have one X and one Y chromosome in each body cell. 4 Chromosomes contain a long DNA molecule divided into sections called genes. 5 Chromosomes include genes which are divided into sections called DNA molecules. Which two statements are correct?

A1 and 2

B1 and 3

C2 and 5

D3 and 4

✓ Correct answer

D: 3 and 4

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2019 Paper 1 Variant 2, question 37.

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