A scientist produces genetically identical offspring from each of two genetically different potato parent plants, A and B, by growing their tubers.
All the plants are 100 mm tall at the start. Each plant receives either 50 cm³ or 100 cm³ of water per day. All other conditions are kept the same.
After 21 days, the scientist records the final height of each plant.
| Parent plant | Water supplied per day in cm³ | Final heights in mm |
|---|---|---|
| A | 50 | 161, 168, 174, 179, 183 |
| A | 100 | 182, 189, 195, 202, 208 |
| B | 50 | 180, 187, 194, 200, 206 |
| B | 100 | 203, 211, 217, 223, 229 |
Describe the variation in final height and explain what the results show about the causes of this variation.
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.