A couple thoughts on all this:
My daughters elementary school teacher sat in one day and told the kids "facts" about the solar system;
She explained that the earth has seasons because of the earths elliptical orbit.
(which is not true)
It took me a while, but decided that the misinformation needed to be corrected.
I saw the principal one day and eased into the subject, correcting her as diplomatically as I could.
She smiled and agreed, but to be honest, I don't think she took it all that well... cest la vie.
Ok, it is true that genetics determine what color something is going to be, however it is not exactly true that the same thing that causes skin color also causes hair or feather color.
In many cases it is melanin that causes color, but this is not always the case (as is proven by the ability to dye chicks at all)
the flamingo is another great example of this
"plumage white or pink (pink colour deriving from pigments in food"
What determines the color of an animals hair, skin or feathers is a function of how light is reflected, refracted and/or absorbed.
The amount of Melanin will determine how much light is reflected and what colors are reflected, but there are other factors that can play a role in color such as the structure of the feather, hair, whatever.
Does egg yolk have something in it that could make chicks, that have a particular feather color or structure, appear yellow?
I am not qualified to answer that.
I know that there are reports that astronauts skin turned orange from eating alot of carrots, although I can't site a credible source that proves that one.
The point is, I can see where a specific color of chick could be affected by the food it eats, and a yellow chick could be yellow because it ate something that was integrated into the structure of its feathers.
It is a plausible idea but does that mean that your teacher is correct... probably not
He may have heard the thing about flamingos and just transferred that knowledge and reapplied it.
I think the idea to test the theory is a great one, however, you will need some detailed information about the structure of chick feathers and how a yellow chick differs from a white chick.
I haven't seen a post on here that says specifically what it is that makes yellow chicks feathers yellow; maybe I missed that?
Quote:
Another thing to think about: If you have a white wall and paint it with yellow paint, it is easier to cover the wall then it would be if you started with a red wall and tried to paint it yellow.
The same applies to altering the color in the chick, if there is already a deep dark color present, it will be difficult to see the affect of an introduced color, such as yellow.
I didn't see in your original post where the teacher made the assertion that "all chicks are yellow" as many who have replied here seem to have assumed.
Maybe there is something to what your teacher said, although I doubt it.
How about this idea; instead of correcting him, tell him you are fascinated by the concept and would like more information on how this works.
Tell him you are interested in the process by which egg yolk is integrated into chicken feathers, and the chemical in the yolk that is responsible for this, seemingly miraculous transformation.
It may be that he is waiting for someone to call his bluff.
It maybe that he isn't jokeing, he may be looking for someone to actually use the scientific method.
Sometimes I go way too long and say too little... sorry about that.
Also, Please don't take points off for spelling and grammer, it always hurts my overall grade
Good luck