Lavender turkeys (also known as self blue) only produce lavender offspring.
Blue
slates look much like lavender but have a few sometimes hard to see black spots
and when
breeding blue slates about 25% of the offspring will be lavender, 25% will
be
a black bird with white spots and about 50% blue slates. I have only lavenders
so all offspring will also be the color of the photo.
That 'thing' that hangs down over the beak on a tom is called a 'snood'.
While the blue slate coloration is relitively easy to find,
the self blues
are much harder to come by.