遺傳特徵
Face Freckles
Freckles are a single on-or-off trait. Having freckles is dominant - one parent passing them on is enough - so freckle-free children need both parents to lack them.
Dominant to recessive
Freckles
Dominant
沒有額外色調 - 只有開或關
Shows up if even one parent passes it on.
No freckles
Recessive
沒有額外色調 - 只有開或關
Both parents must pass it on for a child to show it.
What will my child inherit?
Freckles is dominant: a child shows it whenever at least one parent passes on the gene.
No freckles is recessive: a child only shows it when both parents pass it on.
Two Freckles parents can still have a No freckles child - if both quietly carry the No freckles gene, it can surface.
Two No freckles parents always have No freckles children.