The sex of some fishes is determined by the same XY system as inhumans. An allele of one locus on the Y chromosome of the fish Lebistes causes apigmented spot to appear on the dorsal fin. A male fish that has a spotted dorsal fin is mated witha female fish that has an unspotted fin. Describe the phenotypes of the F1 and of the F2generation produced by allowing the F1 progeny to mate with one another.