Is it possible for a fish with yellow eyes and a fish with purple eyes to produce only purple eyed offspring?

Question

And why?

Answer 1

Yes, the reason this is has to do with alleles and traits. To make it short the purple eyes could have been a dominant allele which would make all the offspring have purple eyes, this means that the yellow eyes are recessive and could show up in a fish if bred again.

Lets say that purple eyes are (CC) the captital C represents purple eyes (Dominant allele) and the yellow eyes are (cc) the lower case c represents yellow eyes (Recessive allele). If these two are cross bred then alll the offspring will be purple eyed because a recessive allele is hidden when a dominant allele is present.

Punnet Square


C C

c Cc Cc

c Cc Cc

C= purple eyes(dominant)
c= yellow eyes(recessive)

Cc= purple eyes, because the dominant allele C is show so the recessive allele c is hidden and since the dominant allele is purple eyes then that means that is the trait is going to be expressed and not the yellow eyes because it is resessive

Answer 2

You might do better posting this question in "Homework Help" or "Biology", but the answer is yes they can. The purple (P) coloration would have to be dominant over yellow(p) eyes. So if you corssed an individual with PP and one with pp, all the fry would have the alleles Pp, so the purple would be the dominant color.

Answer 3

it depends...which trait is dominant and which is recessive? with fish is male and which is female? it could be possible but i need more info.