An unaffected father (square, empty) and a carrier mother (circle with central dot) have three sons; two are affected, one is unaffected. No daughters are affected.
Which inheritance pattern is most consistent with this pedigree?
- A
Mitochondrial
- B
Y-linked
- C
Autosomal dominant
- Dcheck_circle
X-linked recessive
Explanation
A carrier mother passes X^a to ~50% of her sons, who are hemizygous and affected; daughters are mostly carriers/unaffected. This is classic X-linked recessive inheritance.