Requested by --PAND0RA--

Parent 1: A black and ginger calico she-cat with hazel eyes, and medium fur. (Less than 50% white on her pelt)

Parent 2: A chocolate ocicat tom with copper or amber eyes (I honestly can't tell what color they are), and short fur.

Flickerfern's original appearance: A medium furred black and ginger tortoiseshell she-cat with one yellow eye, and one amber eye (at least that's what it looks like in the picrew).

Flickerfern's genetically accurate appearance: A short furred brown (chocolate) and ginger tortoiseshell demigirl (biologically a she-cat) with yellow or amber eyes (doesn't matter which color the eyes are).

Explanation:

So, starting off with the eyes, since that's the easiest thing for me to do! Eye color has little to no correlation with fur color, UNLESS that cat happens to have blue eyes, or heterochromia (like Flickerfern). It is incredibly rare for a cat with less than 50% white on them to have blue eyes or heterochromia. But even if Flickerfern DID have more than 50% white, a cat can only have heterochromia if one eye is blue, so either way, Flickerfern's eyes would both have to be the same color. 

Now, onto her pelt color! I've stated this a billion times already, but fur color is a sex-linked trait, meaning that genes for a cat's fur color are found in their X chromosomes. Toms normally have one X and one Y chromosome, while she-cats have two X chromosomes. This means that a she-cat's appearance is based on the genes of her mother and father, while a tom's appearance is only based on his mother's appearance. Flickerfern is a she-cat at birth because she gets one X chromosome from each parent.

And now, we move on to fur length! Fur length is not a sex-linked trait, so she-cats and toms both get two genes for a specific trait. Kind of like how humans have two genes that control eye color, and brown eyes are dominant to blue eyes. But anyway, short fur (represented by a capital L) is dominant to long/medium fur (represented by a capital L). Flickerfern's mother is a medium furred cat, and since medium fur isn't dominant, Flickerfern's mom would have the genotype ll to signify that there is no dominant trait present. Flickerfern's father is a short furred cat, meaning that he only needs one copy of the short furred gene to be short furred, since dominant traits mask the effects of recessive (non-dominant) traits. However, Flickerfern's father is an ocicat, which is a purebred. Since short fur is a prominent trait of this breed, Flickerfern's dad would not carry the gene for long fur, so he would have the genotype LL. If Flickerfern inherits one gene from her mother, and one gene from her father, she would end up with the genotype Ll, which makes her a short furred cat.

And lastly, white-spotting! White spotting works similar to fur length in the sense that there is one dominant and one recessive trait. In this case, white spotting (represented by Ws) is dominant to no white spotting (represented by ws). But there is a small catch. If a cat has the genotype ws/ws, they'd have absolutely no white on them. If a cat had the genotype Ws/ws, anywhere between 1-50% of their pelt would be covered in white. If a cat had the genotype Ws/Ws, then anywhere between 50-99% of their pelt would be covered in white. So Flickerfern's mother has white on her, but less than 50% of it, so she'd have the genotype Ws/ws. Flickerfern's dad has no white on him, so he'd have the genotype ws/ws. If Flickerfern inherits one recessive gene from each parent, then she would remain a tortoiseshell she-cat without any white on her.

So, that's it! Thanks for requesting!