Recessive Gene Determination
Country: United States
Date: September 2006
How do we know that we have recessive genes in our genotypes?
If one of your parents was homozygous for the recessive gene, then you would
know you carry it. If the dominant gene codes for an enzyme (like Tay-Sachs
for example), then a person that carries the gene will express about half
the amount of the enzyme in their blood. If the gene is known, then it can
be analyzed by DNA analysis to see if two different sequences (one dominant
and the other recessive) of the gene are present in the person.
Ron Baker, Ph.D.
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Update: June 2012