Question

Which is an example of hybridization that would increase hybrid vigor

A.producing a litter of puppies by mating two dogs of different breeds
B. using genetic engineering to insert a gene for vitamin A in carrot plants
C. pollinating the flowers on a tomato plant with pollen from a plant of the same variety
D.choosing a mate for a purebred cat from another littler of offspring from the same mother and father

Answer 1

producing a litter of puppies by mating two dogs of different breeds

though technically, the puppies should have some sort of benefit from being hybrids
On second thought, i think the second option is better

using genetic engineering to insert a gene for vitamin A in carrot plants