Disadvantage of external fertilization?

How many chromosomes are in a gold fish?

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.