Principles of Genetics and Breeding

Problems

1. A hatchery manager spawns and raises channel catfish, blue catfish, and then reciprocal hybrids in order to evaluate the relative growth of these catfishes at his hatchery. He harvest the four groups when they are 18 months old and records the following average weights. What is the heterosis in this experiment?

Group Avg. wt./g

Channel catfish 460

Blue catfish 440

Channel catfish♀ x Blue catfish♂ 600

Blue catfish♀ x Channel catfish♂ 462