2 doctors weighed in:
Does a dominant or recessive allele cause severe combined immunodeficiency?
2 doctors weighed in

Dr. David Rosenthal
Internal Medicine - Allergy & Immunology
In brief: It's complicated
In short, you ask a good question, but the answer is much more complicated.
There are different types of severe combined immunodeficiency (scid). Some are autosomal, and some are x-linked. Many require homozygous changes, others can occur with genetic compounds. None are "autosomal dominant".

In brief: It's complicated
In short, you ask a good question, but the answer is much more complicated.
There are different types of severe combined immunodeficiency (scid). Some are autosomal, and some are x-linked. Many require homozygous changes, others can occur with genetic compounds. None are "autosomal dominant".
Dr. David Rosenthal
Dr. David Rosenthal
Thank
Dr. Javier Chinen
Pediatrics - Allergy & Asthma
In brief: Not an easy answer
A person has two copies (or alleles) for each gene.
One inherited from each parent. Dominant alleles are associated to clinical manifestations even when the other allele is normal. Two recessive alleles are needed to produce clinical manifestations. One recessive allele and one normal would result in a state called 'carrier', with no clinical symptoms.

In brief: Not an easy answer
A person has two copies (or alleles) for each gene.
One inherited from each parent. Dominant alleles are associated to clinical manifestations even when the other allele is normal. Two recessive alleles are needed to produce clinical manifestations. One recessive allele and one normal would result in a state called 'carrier', with no clinical symptoms.
Dr. Javier Chinen
Dr. Javier Chinen
Thank
Get help from a real doctor now
Dr. Arnon Rubin
Board Certified, Internal Medicine
20 years in practice
162K people helped
Continue
108,000 doctors available
Read more answers from doctors