Which describes a concept that was not previously known but was developed as a direct result of mendel’s experiments with pea plants?

organisms with a recessive trait can have a dominant allele for the trait.
all observable traits are dominant.
organisms have more than one observable trait.
organisms can be bred for specific traits based on a pattern of inheritance.

Organisms can be bred for specific traits based on a pattern of inheritance.

The most appropriate answer would be the last option.

Mendel with the help of his experiments with pea plant was able to prove and deduce different laws of genetics such as the law of dominance, the law of segregation, and the law of independent assortment.

Based on these genetic laws, that is, the pattern of inheritance one can breed organisms for specific traits.  

For example, in animal husbandry and plant breeding, different varieties of organisms are bred to bring specific traits in the offspring.