Huntingtons Disease
Huntington's disease is caused by a dominant allele
A dominant allele located on an autosome will be expressed phenotypically in the individual, meaning it will be visible in the physical characteristics of the organism. This dominant allele will mask the effects of any recessive allele at the same locus.
Huntington's Disease
Freckles are considered a dominant trait, as they are caused by a dominant allele. This means that individuals only need to inherit one copy of the allele from either parent in order to have freckles.
it depends on which allele is most dominant in the parents.
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A person who has one dominant and one recessive copy of a disease gene is typically considered to be affected by the condition if the disease is caused by the dominant allele. In this case, the dominant allele's effects will manifest, overshadowing the recessive allele. The individual may not express traits associated with the recessive allele, as the dominant trait takes precedence.
It's caused by an dominant allele.
A form of dwarfism caused by an autosomal dominant allele is achondroplasia. It is characterized by short stature, disproportionately short limbs, and other physical abnormalities. Individuals with this condition have a 50% chance of passing on the allele to their offspring.
If the disorder is caused by a dominant allele, you would expect to see affected individuals in every generation of the pedigree, as it only takes one copy of the dominant allele to express the disorder. Additionally, affected individuals would have at least one affected parent.
No, a defective allele is not always recessive, and a normal allele is not always dominant. The relationship between alleles can be more complex and dependent on specific genetic mechanisms. Dominance and recessiveness are general terms used to describe the relationship between two alleles at a specific gene locus.
If carried on a dominant allele, you either inherit it- and have the disease- or you don't- and do not have the disease, nor the gene that causes it. If you don't have the gene, you can not pass it to your offspring.