Two unaffected parents have an affected child. The trait is most likely
- A
Mitochondrial (transmitted exclusively through the maternal lineage)
- B
Autosomal dominant (one parent must be heterozygous and affected)
- C
Y-linked (passed from affected father to all male offspring only)
- Dcheck_circle
Autosomal recessive (both parents are heterozygous carriers)
Explanation
For dominant traits, every affected child must have at least one affected parent. Recessive: unaffected carriers can produce affected offspring.