A scientist raises two clone lines, J and K, of the same species of water flea. The water fleas within each clone line are genetically identical. Clone lines J and K have different alleles.
All conditions are kept the same except for temperature. The table shows the mean body length after 14 days.
| Clone line | Temperature / °C | Mean body length after 14 days / mm |
|---|---|---|
| J | 18 | 2.6 |
| J | 24 | 2.2 |
| K | 18 | 2.4 |
| K | 24 | 2.0 |
Which difference gives no way to separate the effect of inherited alleles from the effect of temperature?
The 0.6 mm difference between clone line J at 18 °C and clone line K at 24 °C.
The 0.2 mm difference between clone line J at 18 °C and clone line K at 18 °C.
The 0.4 mm difference between clone line J at 18 °C and clone line J at 24 °C.
The 0.2 mm difference between clone line J at 24 °C and clone line K at 24 °C.
80 exam-style questions on AQA GCSE Biology 6.2 Variation and evolution, covering 6.2.1 Variation, 6.2.2 Evolution, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, and 6.2.5 Cloning. Each one has a worked solution and a mark scheme showing where the marks go.