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Meiosis and fertilisation
07/09/2023
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Meiosis and fertilization -Chromosomes XNucleus Gametes (sex cells) such as sperm and egg cells contain Single chromosomes. In gametes, the chromosomes are not paired, they are single. ↳ A gamete contains 2.3 single chromosomes. •Human cells contain chromosoms that are in pairs. ↳ There are 23 pairs Mejosis only takes place in reproductive organs. Males-testes Stagel: all chromosomes are copied C ✓ Females- ovaries Parent cell -Stage 2: cell divides into two Stage 3: cells divide once more, forming the gametels. In the gametes, the chromosomes are single, not paired. Meiasis has halved the number of chromosomes. •Meiosis has produced 4.gametes from the original cell. These gametes are genetically indifferent from eachother. Fertilisation Gamete from male C 23 single fertilization Gomete from female Embryo Chromosomes are Sin not paired! 23 single -The cell now has the normal numbe of chromosomes. -46 (23pa In meiosis, the number of chromosomes is halved but in fertilisation, the full number is restored. Now the cell divides by mitosis producing a clump. 6) identical cells. This is called an embryo.
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