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A-Level Biology OCR A

Variation Genetic Individuals Alleles Gametes Parent Chance Describe

Genetic variation arises from alleles, mutations, meiosis (independent assortment and crossing over), sexual reproduction, and chance.

Genetic variation arises from alleles, mutations, meiosis (independent assortment and crossing over), sexual reproduction, and chance.

Front Describe 5 causes of genetic variation between individuals within a population.
Back Genetic variation causes:
  • Alleles - genes have different alleles, individuals may inherit different alleles 
  • Mutations - changes to DNA sequence can lead to change in proteins coded, if occurred in gamete it can be passed on
  • Meiosis - indepednent assortment and crossing over leads to gametes showing variation
  • Sexual reproduction - offspring inherits alleles from each parent - each individual is different to parent
  • Chance - many different gametes produced from parental genome, result of chance which two combine so offpsring differ from their siblings

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