In a genetics test data from a random sample of 1327 individ

In a genetics test, data from a random sample of 1327 individuals were classified as to whether or not they possessed a genetic abnormality (Factor A), and whether at least one of their parents possessed the genetic abnormality (Factor B) with the following results:

What are the odds that an individual with at least one parent with an abnormal gene also has the abnormal gene?

Compute your answer accurate to four decimals.

Solution

Consider the individials with one parent with abnormal gene.

The total is 692

Parent with abnormal gene also having abnormal = 127

Hence odds = 127/498 = 0.2550