If these two copies both contain the same trait (such as light colored eyes in a human or the lack of yellow pigment in a Quaker) then there is no problem and the trait is expressed (meaning seen externally) as a light-eyed human or a Blue Quaker.
(these two copies; contain; the same trait (such as light colored eyes in a human or the lack of yellow pigment in a Quaker) (the trait; is expressed; ) (meaning; seen; L:externally; as a light-eyed human or a Blue Quaker)
these two copies the trait meaning
contain is expressed seen
the same trait (such as light colored eyes in a human or the lack of yellow pigment in a Quaker
L:externally as a light-eyed human or a Blue Quaker