A student studies variation in dogs.
State the type of reproduction in which meiosis and random fertilisation produce new combinations of existing alleles.
Two observations about body mass in dogs are shown.
| Observation | Description |
|---|---|
| 1 | Two dogs with different alleles have different body masses. |
| 2 | The same dog has a lower body mass after its diet changes. |
State which observation provides evidence that the environment affects body mass.
The table shows part of the original DNA base sequence of a dog gene and two copies of this sequence.
| DNA | Base sequence |
|---|---|
| Original sequence | A C T G C A |
| Copy 1 | A C T G C A |
| Copy 2 | A C T A C A |
State which copy contains a mutation.
Two dogs have different versions of the same gene.
Give the biological term for these different versions.
96 exam-style questions on Edexcel GCSE Biology 3.4 Variation and the Human Genome Project, covering 3.4.1 Causes of variation, 3.4.2 Outcomes of the Human Genome Project, 3.4.3 Genetic variation within a population, and 3.4.4 Effects of genetic mutations on phenotype. Each one has a worked solution and a mark scheme showing where the marks go.