Growing by Dividing
Class 8 Science: reproduction in animals (zygote to embryo)
Start with one zygote and tap Divide. Watch one cell become 2, 4, 8 and more, see each cell get smaller, and grow a ball of cells into an embryo.
Words to know
- Zygote
- The first cell of a new animal, made when a sperm and an egg join (fertilisation).
- Cell division
- One cell splitting into two new cells, each with the same instructions.
- Embryo
- The ball of cells that grows from the zygote and starts to form body parts.
- Fertilisation
- The joining of a male gamete (sperm) and a female gamete (egg).
- Foetus
- The stage of the embryo in which body parts can be seen.
Quick check
Answer 3 questions to check what you learned.
Try at home
Fold a sheet of paper in half, then in half again, five times. Open it and count the boxes: you doubled 1 into 32, just like the cells.