How is variation created and built up during reproduction? Why is there more variation in sexual reproduction?

1. 1 · Define in one line. Variation is the difference between individuals of the same kind.
2. 2 · Asexual reproduction. Small errors in DNA copying give slight differences.
3. 3 · Sexual reproduction. DNA from two parents mixes, giving new combinations and much more variation.
4. 4 · Show how it builds up. [Chart: 1 → 2 → 4 → 8 individuals, each generation slightly more varied]
5. 5 · Link to daily life. Brothers and sisters look alike but are never identical, except identical twins.
6. 6 · Close in one line. Thus reproduction passes on the body design with small changes that add up.

Scoring tip: Mention both sources of variation: copying errors and the mixing of two parents' DNA.