Concept map for genetic variation
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The document discusses the key elements of genetic variation, including alleles, gametes, and mutations. Alleles are different versions of the DNA code within cells. Gametes are male and female sex cells that contain 23 chromosomes each. Genetic variation is caused by gamete formation which creates random sex cells, fertilization where male and female gametes combine randomly, and mutations from incorrect DNA division or environmental factors damaging cells.
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Concept map for genetic variation
- 1. The next slide shows the key elements for this topic in the Gateway Biology for OCR Biology
- 2. Alleles Genetic variation are are Different versions of the cells DNA code Gametes Caused by Male and female sex cells Contain only 23 chromosomes and all are different 1. Gamete formation – splitting of the male and female cell in gamete formation leads to random different sex cells. 2. Fertilisation – when gametes combine during fertilisation the 23 chromosomes from the male and female randomly form the 46 chromosomes of the new baby 3.Mutations – spontaneous incorrect division of DNA OR environmental factors such as aggressive chemical attack, UV, X rays or gamma rays on cells