Question

Give an example of an instance in which you observed co-dominance in nature.

Answer 1

Co-dominance involves expression of both the dominant and recessive phenotypes. For example, a purebred red flower and a purebred white flower can result in spotted red/white flowers.

Note that this isn't the same as incomplete dominance, where the two phenotypes mix to form a new one (e.g. crossing purebred red and white flowers to get solid pink flowers).

As for an example in nature, I'd say that flowers are a solid example.