Gene Location

• Locus of a gene


  Location of a gene on a chromosome
• Autosomally linked genes


  • Alleles on the same chromosome said to be autosomally linked and are inherited as if they were the same gene.
  • The closer the loci of the genes on the chromosome, the more closely linked they are
  • They are far less likely to be separated during recombination in meiosis
• Sex-linked genes


  Genes that occur on the X chromosome
• Some genetic disorders are more common in men because of sex-linked genes
• Y chromosome


  Smaller than the X chromosome, so if men don't have another copy of the allele for a particular character, it is more likely to be expressed
• Genetic disorders


  • Haemophilia (absence of clotting factor VIII)
  • Colour blindness (red-green)