The correct matching is as follows: 
1. Monohybrid cross refers to the breeding of two organisms, which vary in just a single trait. 
2. Phenotype refers to the expression of a genetic trait, that is, what the trait looks like. 
3. Purebred refers to the trait originating from homozygous genes from the offspring of true breeding. 
4. A recessive gene refers to a gene or trait, which is masked when a dominant allele is present. 
5. Self-fertilization refers to the procedure when a species that exhibits both male and female gametes makes the fusion of both the identical gametes to produce offspring.