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4.15 Chromosomes and genes
Exam question
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Describe the structure of a chromosome.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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How many chromosomes are in a human body cell?
(1)Total for this question: 1 mark
4.15 Chromosomes and genes
Exam question
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Explain why chromosomes are found in pairs in body cells.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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State where on a chromosome a gene is found.
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Total for this question: 1 mark
4.15 Chromosomes and genes
Exam question
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Explain why both chromosomes of a pair carry the same genes but may have different alleles.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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Describe how chromosomes are arranged in a karyotype.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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Suggest why people with an extra chromosome 21 have Down's syndrome.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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Which statement about chromosomes is correct?
(1)Total for this question: 1 mark
4.15 Chromosomes and genes
Exam question
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Explain why chromosomes become visible only when a cell divides.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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Compare the chromosomes in a skin cell and a sperm cell.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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Identify the term for the different forms of a gene.
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Total for this question: 1 mark
4.15 Chromosomes and genes
Exam question
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Explain why a chromosome must be copied before a cell divides.
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Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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A dog body cell has 78 chromosomes. Calculate how many pairs this is.
(2)Total for this question: 2 marks
4.15 Chromosomes and genes
Exam question
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Illustrative fact: a potato cell has 48 chromosomes.
Suggest why the number of chromosomes does not show how complex an organism is.
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Total for this question: 2 marks
