Question

An unaffected couple have 7 children - 4 sons and 3 daughters. 3 of the sons are affected from a disease X. X is a _____ disorder.

• A. sex - linked dominant
• B. sex - linked recessive
• C. autosomal dominant
• D. y - linked inheritance

Answer 1

The correct option is B sex - linked recessive


The disease is not Y-linked because the father is unaffected. It is not autosomal dominant because both parents are unaffected. It is not sex linked dominant because all the progeny or the parents are not affected. hence, it is a sex-linked recessive disorder.