Pedigree analysis problem with solution (Example 19)
Q) The trait represented in the following pedigree is expressed only in the males of the family. Is the trait Y linked? Why or why not? If you believe the trait is not Y linked, propose an alternate explanation for its inheritance.
Answer: The trait cannot be Y linked
- Y-linked traits are passed from father to son never from mother to son. Here this criterion is not satisfied.
- An affected father is having an unaffected son (In Y linked trait all son of affected father must be affected)
This trait cannot be X linked
- It is often passed from father to son, whereas X-linked traits are passed from father to daughter.
The most probable mode of inheritance for this trait is sex-limited (only in males) autosomal dominant.