Which of the following provides an example of epistasis?
a) recessive genotypes for each of two genes (aabb) results in an albino corn snake.
b) the allele b17 produces a dominant phenotype, although b1 through b16 do not.
c) in rabbits and many other mammals, one genotype (cc) prevents any fur color from developing.
d) in drosophila (fruit flies), white eyes can be due to an x-linked gene or to a combination of other genes.
e) in cacti, there are several genes for the type of spines.

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.

hope this   and an i get brainlsiest

the areas around the equator