An adult-cell cloning programme has the success rates shown in the table.
| Stage | Success rate |
|---|---|
| Reconstructed eggs develop into embryos | 20% of reconstructed eggs |
| Transferred embryos establish pregnancies | 25% of transferred embryos |
| Established pregnancies produce live young | 40% of established pregnancies |
Every embryo produced is transferred. Assuming these rates remain constant, how many reconstructed eggs are expected to be needed to produce 30 live young?
150 reconstructed eggs
1500 reconstructed eggs
600 reconstructed eggs
375 reconstructed eggs
41 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.