Different Inheritance Patterns

Different Inheritance Patterns

Below is a list of examples for the different genetic combinations that can be created during breeding. Here, ‘wt’ represents the normal allele (wild-type), and ‘mut’ represents the mutant allele. The given percentages are the chances that each individual offspring has on obtaining a particular genotype. The actual phenotype of these combinations, depends on the mode of inheritance.

Autosomal genes

• mut/mut x mut/mut
  • 100% mut/mut
• wt/wt x mut/mut
  • 100% wt/mut
• wt/wt x wt/mut
  • 50% wt/wt
  • 50% wt/mut
• wt/mut x mut/mut
  • 50% wt/mut
  • 50% mut/mut
• wt/mut x wt/mut
  • 25% wt/wt
  • 50% wt/mut
  • 25% mut/mut

X-Linked genes

Males only have a single X-chromosome, and therefore will only have a single copy of an X-linked gene. Males below are depicted as having a “Y” in the place of the missing allele.

• Y/wt x wt/mut
  • 25% Y/wt
  • 25% Y/mut
  • 25% wt/wt
  • 25% wt/mut
• Y/mut x wt/mut
  • 25% Y/wt
  • 25% Y/mut
  • 25% wt/mut
  • 25% mut/mut
• Y/wt x mut/mut
  • 50% Y/mut
  • 50% wt/mut
• Y/mut x mut/mut
  • 50% Y/mut
  • 50% mut/mut