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MDCAT Biology QUESTION #7747
Question 1

Which statement is true for an X-linked dominant trait?

  • All daughters of affected father are affected✔️
  • Half of daughters of affected father are affected
  • No son of affected mother is affected
  • No daughter of affected father is affected
Correct Answer Explanation

Affected father (XᴰY) passes Xᴰ to all daughters (who become affected) and Y to sons (unaffected). Affected mother (XᴰXᵈ) passes Xᴰ to half of sons and daughters.