Answer to Question #209727 in Genetics for Ali Nasrullah

Question

Hypoplasia of enamel (thin, granular enamel, light brown teeth) is inherited as a dominant trait

linked to the X chromosome. A son with normal teeth was born in a family where both parents

suffered from the noted anomaly. Determine the likelihood that the next child will have normal

teeth.

Answer 1

Normal (N)

Abnormal (A)

AN and NN

2NA

a factor becomes dorminant

Likelihood = 2A and 2N

Likelihood= 1/2