Andalusian chickens show incomplete dominance for feather color. a cros between a white bird and a black bird produces mostly blue feathers. a cross between two f1 blue chickens produces mostly blue chickens. are the blue chickens purebred?

No, They are not purebred

Explanation:

Incomplete dominance mean that the two alleles does partial dominance over each other leading to a brand new trait being expressed ( blue feather). In addition, there was no allele representing or coding for blue feather  from the beginning of the generation; blue feather was only the result of the interaction of the partially dominant alleles of white feather and black feather.

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hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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