The allele that causes Huntington's disease is dominant. This means that there only needs to be one present in the gene for it to show in the person's phenotype.
Huntington's Disease.
Huntington's Disease
The following list (thanks to Wikipedia) are diseases caused by an autosomal dominant allele. Familial hypercholesterolemia Polycystic kidney disease Neurofibromatosis type I Hereditary sherocytosis Marfan syndrome Huntington's disease Hereditary nonpolyposis colorectal cancer Multiple exostoses
the allele causes a certain type of protein to form-apex
The allele causes a certain type of protein to form
Lewy Disease is a type of dementia (similar to Alzheimer's) and it has characterics of Parkinson's disease. It causes a type of mental decline.
ringworm is a which type diseas
If someone inherits one A allele for blood type and one B allele for blood type, what will that person's blood type be?
type A
It could happen in two main mechanisms: 1) the allele responsible for the disease is recessive and so each of the parents are healthy portators of the allele (heterozygous), and all the sons which are homozygous for the allele (i.e. have two copies of the allele), with a frequency of 1:4, will be affected by disease, but not the others (heterozygouses and homozygouses for the good allele or wild type). 2) the mutation responsible for the disease (that acts in a dominant manner) is not present in any of the parents but happens only during the formations of gametes, and so will be transmitted to the son. There are also other mechanisms that are less frequent and more difficult to explain in a few words.
An allele is a variation or a type of gene
A pathogen causes infectious disease. For instance, influenza virus is the pathogen that causes flu.