Exercise 1 — IGCSE 0653 Mar 2025 Paper 32 Q9
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8 / eight
Cambridge IGCSE·Combined Sciences 0653·Physics
Inheritance
Key knowledge — Inheritance
Key facts & rules
- Chromosome: structure made of DNA; humans have 46 (23 pairs); gametes have 23 (haploid).
- Gene: section of DNA that codes for a protein/characteristic.
- Allele: a version of a gene. Dominant allele (capital letter) masks recessive (lower case).
- Genotype: genetic makeup (e.g. Tt). Phenotype: observable characteristics.
- Homozygous: both alleles the same (TT or tt). Heterozygous: different alleles (Tt).
- Monohybrid cross: Punnett square — 3:1 ratio (Aa × Aa) or 1:2:1 (genotype ratio).
- Sex determination: XX = female; XY = male. Father determines sex of offspring.
- Mutation: change in DNA sequence — can be caused by radiation or chemicals.
- Meiosis: produces 4 haploid gametes with genetic variation (crossing over + independent assortment).
IGCSE Physics — Inheritance
21 Cambridge IGCSE 0653 Combined Sciences past paper questions on inheritance, across Theory, Multiple Choice and Alternative to Practical.
Theory
Inheritance — Core11 · Paper 3
Exercise 2 — IGCSE 0653 May/Jun 2023 Paper 31 Q9
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path of ray drawn from lamp to computer screen to eye using straight lines
Exercise 3 — IGCSE 0653 May/Jun 2024 Paper 31 Q9
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E
Exercise 4 — IGCSE 0653 May/Jun 2024 Paper 32 Q9
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R = V I in any form / 1.5 4(.0)
Exercise 5 — IGCSE 0653 May/Jun 2024 Paper 33 Q9
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R = V I in any form / 3.1 0.55
Exercise 6 — IGCSE 0653 May/Jun 2025 Paper 31 Q9
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fuse
Exercise 7 — IGCSE 0653 May/Jun 2025 Paper 32 Q9
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(the) Milky Way
Exercise 8 — IGCSE 0653 May/Jun 2025 Paper 33 Q9
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Mars
Exercise 9 — IGCSE 0653 Oct/Nov 2023 Paper 31 Q9
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X-rays
Exercise 10 — IGCSE 0653 Oct/Nov 2023 Paper 32 Q9
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focal length
Exercise 11 — IGCSE 0653 Oct/Nov 2023 Paper 33 Q9
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focal length
Inheritance — Extended10 · Paper 4
Exercise 1 — IGCSE 0653 Mar 2024 Paper 42 Q9
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S
Exercise 2 — IGCSE 0653 May/Jun 2023 Paper 43 Q9
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(peaks represent) particles closer together
Exercise 3 — IGCSE 0653 May/Jun 2024 Paper 41 Q9
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F
Exercise 4 — IGCSE 0653 May/Jun 2024 Paper 42 Q9
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a.c. power supply
Exercise 5 — IGCSE 0653 May/Jun 2024 Paper 43 Q9
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volts
Exercise 6 — IGCSE 0653 May/Jun 2025 Paper 42 Q9
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mass
Exercise 7 — IGCSE 0653 May/Jun 2025 Paper 43 Q9
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13.8 billion years
Exercise 8 — IGCSE 0653 Oct/Nov 2023 Paper 41 Q9
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compression correctly labelled with label line and letter C AND
Exercise 9 — IGCSE 0653 Oct/Nov 2023 Paper 42 Q9
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evidence of, P = IV / 18 240
Exercise 10 — IGCSE 0653 Oct/Nov 2023 Paper 43 Q9
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burn (to skin) / damage to eyes / blindness
All Inheritance questions in this collection
| Type | Level | Paper | Session | Q# | Marks | Answer / key |
|---|---|---|---|---|---|---|
| Theory | Core | Paper 32 | Mar 2025 | Q9 | 9 marks | 8 / eight |
| Theory | Core | Paper 31 | May/Jun 2023 | Q9 | 10 marks | path of ray drawn from lamp to computer screen to eye using straight lines |
| Theory | Core | Paper 31 | May/Jun 2024 | Q9 | 7 marks | E |
| Theory | Core | Paper 32 | May/Jun 2024 | Q9 | 9 marks | R = V I in any form / 1.5 4(.0) |
| Theory | Core | Paper 33 | May/Jun 2024 | Q9 | 9 marks | R = V I in any form / 3.1 0.55 |
| Theory | Core | Paper 31 | May/Jun 2025 | Q9 | 10 marks | fuse |
| Theory | Core | Paper 32 | May/Jun 2025 | Q9 | 9 marks | (the) Milky Way |
| Theory | Core | Paper 33 | May/Jun 2025 | Q9 | 10 marks | Mars |
| Theory | Core | Paper 31 | Oct/Nov 2023 | Q9 | 8 marks | X-rays |
| Theory | Core | Paper 32 | Oct/Nov 2023 | Q9 | 7 marks | focal length |
| Theory | Core | Paper 33 | Oct/Nov 2023 | Q9 | 7 marks | focal length |
| Theory | Extended | Paper 42 | Mar 2024 | Q9 | 9 marks | S |
| Theory | Extended | Paper 43 | May/Jun 2023 | Q9 | 8 marks | (peaks represent) particles closer together |
| Theory | Extended | Paper 41 | May/Jun 2024 | Q9 | 7 marks | F |
| Theory | Extended | Paper 42 | May/Jun 2024 | Q9 | 7 marks | a.c. power supply |
| Theory | Extended | Paper 43 | May/Jun 2024 | Q9 | 9 marks | volts |
| Theory | Extended | Paper 42 | May/Jun 2025 | Q9 | 10 marks | mass |
| Theory | Extended | Paper 43 | May/Jun 2025 | Q9 | 8 marks | 13.8 billion years |
| Theory | Extended | Paper 41 | Oct/Nov 2023 | Q9 | 10 marks | compression correctly labelled with label line and letter C AND |
| Theory | Extended | Paper 42 | Oct/Nov 2023 | Q9 | 8 marks | evidence of, P = IV / 18 240 |
| Theory | Extended | Paper 43 | Oct/Nov 2023 | Q9 | 8 marks | burn (to skin) / damage to eyes / blindness |