Fertilisation is the joining together of a haploid gamete cell to another, each haploid cell from each parent, during sexual reproduction.
Each haploid gamete cell has half the normal number of chromosomes to make up a new cell with all 46 chromosomes containing both parents' genetic information. This new cell is a diploid zygote.
The cells from each parent that join to form a zygote are called gametes. In humans, these are sperm from the man and an egg from the woman. Human sperm contains 23 chromosomes and a human egg contains 23 chromosomes. A human zygote formed by the fertilisation of them contains 46 chromosomes. A zygote diploid cell grows to form an embryo in the womb.
Gametes contain different genetic information to each other and to the parent cell. Meiosis is responsible for genetic variation.
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