it does not look like a Black Wyandotte, and while is quite hard to have a completely black bird with clean yellow shanks(they are not extended black, they are Birchen based with melanizers), the male shown on this thread is clearly a Wyandotte x Black breed cross. the Rose comb is dominant so it will be shown F1, and a gold laced Wyandotte crossed with a Extended black bird the rooster would be all black due to the melanizers(Ml and Pg)