An aquatic organism produces offspring from small outgrowths on its body. Cells in each outgrowth divide by mitosis before the outgrowth separates from the adult. Only one adult is involved.
A researcher compares a short section of DNA from the adult and three offspring.
| Organism | DNA base sequence |
|---|---|
| Adult | A C G T T A C G A A |
| Offspring 1 | A C G T T A C G A A |
| Offspring 2 | A C G T T A C G A A |
| Offspring 3 | A C G T C A C G A A |
Explain why the researcher concluded that the organism reproduced asexually, even though offspring 3 was not genetically identical to the adult.
62 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.