Will yellow muscovy ducklings turn chocolate colored

[kristinn]

My chocolate muscovy duckling hatched out 9 ducklings and I have 2 that are all yellow, no hint of brown or any other color. Will they be all white or can they turn chocolate colored like momma? Dad is black pied. I only ask because I have a friend whos been looking for all white muscovies and I'd like to give him these 2, but not if they will turn out brown! If they could turn brown, how long would it take for the chocolate color to show up? TIA

Momma

Babies (one of the 3 yellow ones has a tiny black dot on its head so I know that one will be mostly white)

Dad (on right)

 

[kristinn]

I know the chocolate color is a recessive trait, and the parents of my male were white and black pied.. just want to see if anyone knows for sure!