BY5.4 Genes and Alleles

Genes and Alleles

1866 Gregor Mendell


  • basic unit of inheritance
  • carried on and transmitted by chromosomes
  • consist of DNA

main characteristics of genes:

  • separate and combine
  • mutate
  • code


  • alternative forms of a gene occupying a simiar gene-position (locus) on a homologous chromosome
  • alleles that make up the gene exist in 2 forms

3 different allele combinations for any one locus:

  • heterozygous:
    • dominant and recessive allele present
    • each…


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