Which is an example of hybridization that would increase hybrid vigor?
producing a litter of puppies by mating two dogs of different breeds
using genetic engineering to insert a gene for vitamin A in carrot plants
pollinating the flowers on a tomato plant with pollen from a plant of the same variety
choosing a mate for a purebred cat from another littler of offspring from the same mother and father

Question

Which is an example of hybridization that would increase hybrid vigor?
producing a litter of puppies by mating two dogs of different breeds
using genetic engineering to insert a gene for vitamin A in carrot plants
pollinating the flowers on a tomato plant with pollen from a plant of the same variety
choosing a mate for a purebred cat from another littler of offspring from the same mother and father