Hallmarks of X-linked recessive inheritance include
- A
More affected females than males; affected mothers always pass the trait to all of their daughters
- B
Equal frequency of affected males and females; the trait appears in every generation of a pedigree
- C
Always passed from father to son only; affected mothers cannot transmit the trait to any offspring
- Dcheck_circle
More affected males than females; affected fathers cannot pass to sons; daughters of affected fathers are obligate carriers
Explanation
Males have only one X (hemizygous), so a single recessive X-linked allele is expressed. Father's Y goes to sons; affected father's X^c goes to daughters as carriers.