A couple is worried about having a child with a genetic disorder so they go to a genetic counselor. The counselor takes a sample of cells from their mouth to determine if there is a possibility of having a genetic disorder. Explain why they the sample from the mouth instead of simply looking at sperm or egg cells.

Answer :

they took a sample from the month so they can seeexamine a person's genes, usually in order to estimate their risk of a particular disease, determine the exact cause of cell changes, or detect any hereditary diseases.  

Explanation:

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a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.