AGB 121: Principles of Animal Genetics and Population Genetics (2+1)

Exceptions to Mendel’s laws

EXCEPTIONS TO MENDEL'S LAW

• Mutations and polyploidy are exceptions to the law of segregation or law of purity of gametes.
• Linkage is an exception to Mendel’s second law i.e. law of independent assortment.
• Incomplete dominance is an exception to the principle of dominance.
• Pleiotropism is an exception to the principle of unit characters.
• Modification of F₂ ratios due to incomplete dominance, codominance, lethal factors, interaction of factors, epistatic factors are all exceptions.