A species of stick insect can reproduce sexually or asexually.
Sexual reproduction involves gametes from two parents. Asexual reproduction involves one female producing young without fertilisation.
Name the type of cell division that produces genetically different gametes.
State how random fertilisation increases genetic variation in the young.
State the only source of genetic variation among young produced asexually from one female.
Newly hatched young produced asexually by one female were placed into two groups. All conditions were kept the same except the mass of leaves provided.
| Group | Mass of leaves provided per insect each day in g | Mean body mass after 30 days in mg |
|---|---|---|
| X | 0.4 | 320 |
| Y | 1.2 | 470 |
Explain the difference between the mean body masses of the two groups.
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.