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Name: Lottie
Status: Student
Grade:  4-5
Location: N/A
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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