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5.1 Inheritance

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Question 8
F

Gregor Mendel investigated how characteristics are inherited in pea plants.

  • He crossed plants that always produced tall offspring with plants that always produced dwarf (short) offspring.
  • All the offspring in the first generation were tall.
  • He then crossed these tall plants with each other.

The Table shows his results for the second generation.

Table

PhenotypeNumber of plants
tall787
dwarf277
a.

Calculate the ratio of tall plants to dwarf plants in the second generation.

Give your answer to the nearest whole number in the form x:1x:1x:1.

[2]
b.

Mendel said that characteristics are controlled by 'inherited factors'.

State the modern name for these inherited factors.

[1]
c.

Explain why all the plants in the first generation were tall.

[2]
d.

Mendel's ideas were not accepted by other scientists until many years after his death.

Suggest one reason why.

[1]
Markscheme

5.1 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /5.1 Inheritance

186 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.

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