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Sure, your duckling is heterozygous or carrying both the recessive harlequin allele and the normal one. So, half of the ducklings should look like Welsh Harlequin. If he is a drake, he is also heterozygous for brown. So, his sons will all show black (but 1/2 carry brown), and there is a 50-50...

I am afraid you did it backwards. You needed the drake to be brown and the hen to be black or silver to get sex linked ducklings. So, all your ducklings will get the dominant, black allele from their daddy and be black instead of brown. In this case, your duckling could be either gender but...