6.1.2: Meiosis
Not started yet — this one needs some love.
Cells in reproductive organs divide by meiosis to form gametes.
Before meiosis, copies of the genetic information are made.
The cell divides twice to form four gametes, each with a single set of chromosomes.
All gametes are genetically different from each other.
Gametes join at fertilisation to restore the normal number of chromosomes.
The new cell divides by mitosis, the number of cells increases, and cells differentiate as the embryo develops.
Knowledge of the stages of meiosis is not required.
Common exam mistakes
Do not use human chromosome numbers automatically; use the chromosome numbers given in the question.
Meiosis forms gametes with half the normal chromosome number, so fertilisation can restore the normal number.
Do not say meiosis happens "in gametes"; meiosis produces gametes.
If the question asks why chromosome number changes, do not give a long mitosis comparison instead.