Dominant inheritance:
Dominant alleles that cause serious defects to a person don't particularly get passed on because people with such alleles frequently die before they have the chance to reproduce. One condition that goes against this is called Huntington disease. It is characterised by the involuntary flailing movements of the arms and legs. As this disease is controlled by a dominant allele, the condition is very likely to be passed on through generations.
Some other genetic disorders caused by dominant alleles are:
- Achondroplasia: which is a form of dwarfism, characterised by short limbs, prominent head and a waddling gait.
- Facioscapulohumeral: a rare form of muscular dystrophy affecting the facial muscles.
- Neurofibromatosis: inherited as dominant, gives individuals numerous tumours along the peripheral nerves.
Some other genetic disorders caused by dominant alleles are:
- Achondroplasia: which is a form of dwarfism, characterised by short limbs, prominent head and a waddling gait.
- Facioscapulohumeral: a rare form of muscular dystrophy affecting the facial muscles.
- Neurofibromatosis: inherited as dominant, gives individuals numerous tumours along the peripheral nerves.